阅读说明：本技术 用于发声装置的振膜及发声装置 (Vibrating diaphragm for sound production device and sound production device ) 是由 王海峰 王婷 李春 于 2021-08-16 设计创作，主要内容包括：本发明公开了一种用于发声装置的振膜及发声装置。其中振膜包括至少一层硅橡胶膜层,所述硅橡胶膜层是以侧链含有乙烯基的聚硅氧烷作为基础聚合物,在所述基础聚合物中添加填料、交联剂和核壳结构催化剂,经混炼,硫化成型得到；所述核壳结构催化剂包括内核和包裹在内核外的外壳,所述内核为铂金催化剂,所述外壳为热塑性材料。本发明在保证硅橡胶储存稳定性情况下,可实现硅橡胶低温快速固化,从而提高振膜的生产效率,降低了能耗。(The invention discloses a vibrating diaphragm for a sound generating device and the sound generating device. The vibrating diaphragm comprises at least one layer of silicon rubber film layer, wherein the silicon rubber film layer is obtained by taking polysiloxane with a side chain containing vinyl as a basic polymer, adding a filler, a cross-linking agent and a core-shell structure catalyst into the basic polymer, mixing, vulcanizing and molding; the core-shell structure catalyst comprises an inner core and an outer shell wrapped outside the inner core, wherein the inner core is a platinum catalyst, and the outer shell is a thermoplastic material. The invention can realize low-temperature rapid curing of the silicon rubber under the condition of ensuring the storage stability of the silicon rubber, thereby improving the production efficiency of the vibrating diaphragm and reducing the energy consumption.)

1. The vibrating diaphragm for the sound production device is characterized by comprising at least one layer of silicon rubber film layer, wherein the silicon rubber film layer is obtained by taking polysiloxane with vinyl-containing side chains as a basic polymer, adding a filler, a cross-linking agent and a core-shell structure catalyst into the basic polymer, mixing, vulcanizing and molding; the core-shell structure catalyst comprises an inner core and an outer shell wrapped outside the inner core, wherein the inner core is a platinum catalyst, and the outer shell is a thermoplastic material.

2. The diaphragm for a sound generating apparatus according to claim 1, wherein the core-shell catalyst is prepared by a phase separation method, and the particle size of the core-shell catalyst is 0.1 μm to 50 μm.

3. The diaphragm for a sound generating apparatus as claimed in claim 2, wherein the thickness of the shell in the core-shell structure is 0.05 μm to 40 μm.

4. The diaphragm for a sound-emitting device according to claim 1, wherein the platinum catalyst is chloroplatinic acid or a platinum (0) -divinyl-tetramethyldisiloxane compound.

5. The diaphragm for a sound generating apparatus as claimed in claim 1, wherein the housing is a thermoplastic material having a softening point of 50 ℃ to 100 ℃.

6. The diaphragm for a sound generating apparatus as claimed in claim 5, wherein the thermoplastic material is one or more selected from paraffin, acrylate polymer, polyethylene, polyvinyl chloride, and polystyrene.

7. The diaphragm for a sound generating apparatus as claimed in claim 1, wherein the base polymer is one or more of vinyl polysiloxane, hydroxy vinyl polysiloxane, and phenyl vinyl polysiloxane.

8. The diaphragm for a sound generating apparatus as claimed in claim 1, wherein the filler is one or more of silica, mica, graphene, clay, calcium carbonate, carbon nanotube, kaolin, and talc.

9. The diaphragm for a sound-emitting device as claimed in claim 1, wherein the cross-linking agent is hydrogen-containing silicone oil.

10. The diaphragm for a sound-generating apparatus as claimed in claim 1, wherein the thickness of the diaphragm is 40 μm to 150 μm.

11. The diaphragm for a sound generating apparatus as claimed in claim 1, wherein the curing molding temperature of the silicone rubber film layer is 50 ℃ to 100 ℃.

12. A sound production device, comprising a vibration system and a magnetic circuit system matched with the vibration system, wherein the vibration system comprises a diaphragm and a voice coil combined on one side of the diaphragm, the magnetic circuit system drives the voice coil to vibrate to drive the diaphragm to produce sound, and the diaphragm is the diaphragm according to any one of claims 1 to 11.

13. The utility model provides a sound production device, its characterized in that includes the casing and establishes magnetic circuit and vibration system in the casing, vibration system includes voice coil loudspeaker voice coil, first vibrating diaphragm and second vibrating diaphragm, the top of voice coil loudspeaker voice coil with first vibrating diaphragm links to each other, magnetic circuit drive the voice coil loudspeaker voice coil vibration is in order to drive first vibrating diaphragm sound production, the both ends of second vibrating diaphragm respectively with the casing with the bottom of voice coil loudspeaker voice coil links to each other, the second vibrating diaphragm be any one of claim 1 ~ 11 the vibrating diaphragm.

14. An electronic device characterized by comprising the sound emitting apparatus of claim 12 or claim 13.

Technical Field

The invention relates to the technical field of acoustic products, in particular to a vibrating diaphragm for a sound generating device and the sound generating device.

Background

The silicon rubber has the performances of high and low temperature resistance, high resilience and the like, and can obviously improve the acoustic performance and reliability of the vibrating diaphragm at high temperature and high power when applied to the acoustic vibrating diaphragm, and avoid the problems of diaphragm folding, diaphragm breaking and the like. In the prior art, the silicon rubber is usually added with a platinum catalyst and cured by peroxide.

When the silicone rubber is a peroxide curing type, 2, 5-dimethyl-2, 5-bis (tert-butylperoxy) hexane, namely DCBP for short, and 2, 4-dichlorobenzoyl peroxide, namely DBPH for short, are commonly used as vulcanizing agents, wherein the temperature for vulcanizing the bis (dipenta) is about 175 ℃, the temperature for vulcanizing the bis (dipenta) is above 120 ℃, the vulcanizing temperatures of the bis (dipenta) and the bis (tetrad) are high, and odor is generated after vulcanization.

When the silicon rubber is an addition type of platinum catalyst, the platinum catalyst generally needs to be used together with an inhibitor (usually adopting an alkynol compound), the inhibitor and the platinum catalyst form a complex compound, so that the silicon rubber and the catalyst are mixed and then the silicon rubber is not crosslinked at normal temperature for a long time, and when the temperature reaches the vulcanization temperature, the complex compound is decomposed to enable the platinum catalyst to exert the reaction activity so as to crosslink the silicon rubber. Although the vulcanization temperature of the platinum catalyst addition type is lower than that of the peroxide curing type, the temperature still needs to be over 140 ℃, and the platinum catalyst needs to be used together with an inhibitor to better exert the reaction activity of the platinum catalyst, and in addition, the addition of the inhibitor can increase the energy consumption and influence the production efficiency of the diaphragm.

The inventors of the present application have recognized that: a vibrating diaphragm for sound generating mechanism such as speaker vibrating diaphragm, because have single small, characteristics such as many, so the production efficiency requirement to single vibrating diaphragm product is high. However, if the loudspeaker diaphragm is prepared by using the peroxide curing type and platinum catalyst addition type vulcanized silicone rubber, the problems of high temperature required in the whole process, long temperature rise and fall time, high temperature resistance requirement on other shells and the like exist, so that the production efficiency of the diaphragm is low; in addition, the above manner also results in a longer time for each batch of rubber compound, due to the small individual volume of the diaphragm.

Therefore, the improvement of the production efficiency of the loudspeaker diaphragm has become a great technical problem in the field of acoustic products.

Disclosure of Invention

The invention aims to provide a vibrating diaphragm for a sound generating device and the sound generating device.

The above purpose of the invention is realized by the following technical scheme:

according to one aspect of the invention, the vibrating diaphragm for the sound generating device comprises at least one silicon rubber film layer, wherein the silicon rubber film layer is obtained by taking polysiloxane with vinyl-containing side chains as a basic polymer, adding a filler, a cross-linking agent and a core-shell structure catalyst into the basic polymer, mixing, vulcanizing and molding; wherein, the core-shell structure catalyst comprises: the composite material comprises an inner core and a shell wrapped outside the inner core, wherein the inner core is a platinum catalyst, and the shell is a thermoplastic material.

Optionally, the core-shell structure catalyst is prepared by a phase separation method.

Optionally, the particle size of the core-shell structure is 0.1 μm to 50 μm.

Optionally, the thickness of the shell in the core-shell structure is 0.05 μm to 40 μm.

Alternatively, the platinum catalyst may be chloroplatinic acid or a platinum (0) -divinyl-tetramethyldisiloxane complex, i.e., platinum (0) -1, 3-divinyl-1, 1,3, 3-tetramethyldisiloxane.

Optionally, the housing is a thermoplastic material having a softening point of 50 ℃ to 100 ℃.

Alternatively, the thermoplastic material may be one or more of paraffin, acrylate polymer, polyethylene, polyvinyl chloride and polystyrene.

Alternatively, the base polymer can be one or more of vinyl polysiloxane, hydroxy vinyl polysiloxane and phenyl vinyl polysiloxane.

Optionally, the filler is one or more of silica, mica, graphene, clay, calcium carbonate, carbon nanotubes, kaolin, and talc.

Optionally, the cross-linking agent is a hydrogen-containing silicone oil.

Optionally, the thickness of the diaphragm is 40 μm to 150 μm.

Optionally, the curing and forming temperature of the silicone rubber film layer is 50 ℃ to 100 ℃.

According to another aspect of the present invention, the present invention provides a sound generating apparatus, including a vibration system and a magnetic circuit system cooperating with the vibration system, where the vibration system includes a diaphragm and a voice coil coupled to one side of the diaphragm, the magnetic circuit system drives the voice coil to vibrate to drive the diaphragm to generate sound, and the diaphragm is the diaphragm of the present invention.

The invention provides another sound production device which comprises a shell, and a magnetic circuit system and a vibration system which are arranged in the shell, wherein the vibration system comprises a voice coil, a first vibration film and a second vibration film, the top of the voice coil is connected with the first vibration film, the magnetic circuit system drives the voice coil to vibrate so as to drive the first vibration film to produce sound, two ends of the second vibration film are respectively connected with the shell and the bottom of the voice coil, and the second vibration film is the vibration film.

The invention also provides electronic equipment comprising the sound generating device.

Compared with the prior art, the core-shell structure catalyst is added into the base polymer, so that the low-temperature rapid curing of the silicon rubber is realized on the premise of ensuring the storage stability of the silicon rubber for the vibrating diaphragm, the production efficiency of the vibrating diaphragm is obviously improved, and the energy consumption and the process loss are reduced.

The advantages of the invention are embodied in particular in that: (1) according to the invention, the silicon rubber is improved by adding the platinum catalyst with the core-shell structure, so that the silicon rubber has a low vulcanization temperature of 50-100 ℃, a high curing speed and a long quality guarantee period. (2) According to the invention, no inhibitor is required to be added, the shell softening point of the core-shell structure catalyst is 50-100 ℃, the shell softening point is reached in the heating process, the shell is softened and broken to release the catalyst, and the catalyst is cured at 50-100 ℃, and after the shell is damaged, the core layer, namely the core platinum catalyst, can continue to react in the cooling process after being released, so that compared with the mode of manufacturing the vibrating diaphragm by adding the platinum inhibitor or peroxide vulcanized silicone rubber, the production efficiency of the invention is obviously improved, the energy consumption is reduced, and the production process loss is reduced. (3) The platinum catalyst has the protection of a shell layer, and after the catalyst is added, the preservation time of the rubber compound is longer on the premise of ensuring low temperature and short-time curing, the shelf life is prolonged from several weeks to half a year, and the platinum catalyst has the advantage of stable storage.

Drawings

FIG. 1 is a schematic structural diagram of a core-shell structured catalyst in an embodiment of the present invention;

FIG. 2 is a temperature-time linear graph in a process of manufacturing diaphragms according to examples of the present invention and comparative examples.

FIG. 3 is a schematic diagram of a sound generator according to an embodiment of the present invention;

fig. 4 is an exploded schematic view of fig. 3.

In fig. 1, 40 shells and 50 cores. In fig. 2, reference numeral 1 is a temperature increase and decrease curve of the bis-pentasulfide of comparative example 1; reference numeral 2 is a temperature rise and fall curve of the combined action of the platinum catalyst and the inhibitor; reference numerals 3 to 5 respectively represent temperature increase and decrease curves in embodiments 1 to 3 of the present invention, that is, reference numerals 3 to 5 respectively represent temperature increase and decrease curves under the action of a core-shell platinum catalyst having a softening point of 100 ℃, 80 ℃ and 60 ℃. In fig. 3 and 4, 10 a housing, 20 a magnetic circuit system, 31 a first diaphragm, 32 a second diaphragm, 33 a voice coil.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The invention provides a vibrating diaphragm for a sound generating device, which comprises at least one layer of silicon rubber film layer, wherein the silicon rubber film layer is obtained by adding a filler, a cross-linking agent and a core-shell structure catalyst into a basic polymer, mixing and vulcanizing and forming by taking polysiloxane containing vinyl on a side chain as the basic polymer. The invention obviously improves the production efficiency of the vibrating diaphragm and greatly reduces the energy consumption and the process loss.

The base polymer is polysiloxane containing vinyl on a side chain. Further, the base polymer can be one or more of vinyl polysiloxane, hydroxy vinyl polysiloxane and phenyl vinyl polysiloxane, and can be methyl vinyl silicone rubber, methyl vinyl phenyl silicone rubber, hydroxy-terminated dimethyl methyl vinyl polysiloxane and the like.

The cross-linking agent may be a hydrogen-containing silicone oil. Specifically, for example, hydrogen-terminated silicone oil, side hydrogen silicone oil, and the like can be mentioned. the-Si-H bond in the cross-linking agent is reacted with-CH ═ CH in vinyl polysiloxane under the action of an inner core platinum catalyst₂An addition reaction occurs to vulcanize the cross-linked silicone rubber.

The filler can be one or more of silicon dioxide, mica, graphene, clay, calcium carbonate, carbon nano tubes, kaolin and talcum powder.

Fig. 1 schematically shows a layer structure of a core-shell structure catalyst, as shown in fig. 1, the core-shell structure catalyst includes an inner core 50 and an outer shell 40 wrapped outside the inner core 50. The inner core 50 is a platinum catalyst, and may be, for example, chloroplatinic acid or a platinum (0) -divinyl-tetramethyldisiloxane compound. The housing 40 may be a thermoplastic material having a softening point. Preferably, the softening point of the housing 40 is 50 ℃ to 100 ℃, for example, 50 ℃, 60 ℃, 70 ℃, 80 ℃, 90 ℃, 100 ℃ and the like, so as to ensure the low-temperature vulcanization effect of the silicone rubber. The thermoplastic material adopted by the shell can be one or more of paraffin, polyethylene, polyvinyl chloride, polystyrene, acrylate polymer and the like. For example, the housing 40 may be one or more of paraffin, polyethylene wax, and the like, and the paraffin, the polyethylene wax and the like are commercially available materials having a softening point of 50 ℃ to 100 ℃, and the materials are easily available. The catalyst adopted in the embodiment of the invention is a core-shell structure formed by wrapping a platinum catalyst by a thermoplastic material with a low softening point, the platinum catalyst is protected by a shell 40 at normal temperature and has no catalytic activity, but when the temperature reaches the softening point of the shell 40, the shell 40 is softened and cracked to release the platinum catalyst, and the base polymer and a cross-linking agent are catalyzed to perform addition reaction and vulcanization cross-linking, so that the fast curing can be performed at the low temperature of 50-100 ℃ on the premise of maintaining the long quality guarantee period of the rubber compound at normal temperature, the production efficiency of the vibrating diaphragm is further improved, the energy consumption is reduced, and the loss of the production process is reduced.

In an optional embodiment, the core-shell structure catalyst can be prepared by a phase separation method, and a shell wraps a platinum catalyst to form a microcapsule structure which has a control function on the release of the catalyst. The preparation process of the core-shell structure catalyst can comprise the following steps: melting and dissolving the shell material in a hydrocarbon solvent at 60-115 ℃, adding a platinum catalyst, and uniformly mixing to obtain a first solution; heating the mixture in water to 50-60 ℃ to dissolve polyvinyl alcohol to obtain a second solution; and pouring the first solution into the second solution, quickly stirring, heating to 90-110 ℃, reducing the temperature to room temperature to obtain a catalyst suspension, filtering, and washing to obtain the core-shell structure catalyst. The core-shell structure catalyst prepared by the method has the advantages of good embedding effect, simple process and easiness in control, can be used for preparing a core-shell structure with the grain diameter of 0.1 micron, has excellent shell thickness and strength, can meet the use requirements of the core-shell structure, and has excellent effects such as low-temperature protection effect, effect of cracking and releasing the catalyst under softening and the like. The solution b is prepared from polyvinyl alcohol, the solution a is poured into the solution b to be stirred, and the temperature is reduced after heating, so that the shell wrapping performance of the obtained core-shell structure catalyst is good, and the shell structure breakage is reduced.

In a specific embodiment, preparing a core-shell structured catalyst comprises: 1) 20g of polyethylene wax with the melting point of about 60-100 ℃ and 10 g of petroleum ether with the boiling point of about 50-110 ℃ are heated to 60-115 ℃,3 g of platinum (0) -1, 3-divinyl-1, 1,3, 3-tetramethyldisiloxane compound with the platinum content of 5000ppm are added, and the mixture is uniformly mixed to obtain solution a for later use. 2) 0.2g of polyvinyl alcohol was added to 40g of water, and the mixture was heated to 55 ℃ and dissolved with stirring to obtain a solution b. 3) And (4) pouring the solution a into the solution b, quickly stirring, heating to 100 ℃, reducing the temperature to 25 ℃ to obtain a catalyst suspension, filtering the catalyst suspension, and washing to obtain the core-shell structure catalyst. In the embodiment, the easily-obtained polyethylene wax with the melting point of 60-100 ℃ is used as the shell material, the catalyst is added after the polyethylene wax is melted to prepare the core-shell structure catalyst, nano materials such as titanium oxide and the like do not need to be added, and meanwhile, the core-shell structure catalyst with good wrapping property and better shell strength can be obtained by controlling all parameters.

The core-shell structure catalyst used in the present invention preferably has a core-shell structure particle diameter of 0.1 μm to 50 μm, and may be, for example, 0.1 μm, 0.5 μm, 1 μm, 10 μm, 20 μm, 30 μm, 40 μm, or 50 μm. Further, the thickness of the shell in the core-shell structure may be 0.05 μm to 40 μm, and may be, for example, 0.05 μm, 0.1 μm, 0.5 μm, 1 μm, 10 μm, 20 μm, 30 μm, 40 μm, or the like. By adopting the core-shell structure catalyst with the particle size, the inert shell can achieve a better protection effect at normal temperature, and meanwhile, when the temperature reaches the softening point of the shell, the shell can be quickly softened and broken and release the platinum catalyst to effectively exert the catalytic performance of the platinum catalyst.

Preferably, the particle diameter of the core-shell structure can be 0.1-30 μm, and the thickness of the outer shell can be 0.05-20 μm, so as to improve the catalytic effect of the core-shell structure catalyst. Of course, in order to further improve the effect of the catalyst, a core-shell structure catalyst having a core-shell structure particle diameter of 0.1 μm to 1 μm and a shell thickness of 0.05 μm to 1 μm may be prepared.

In an alternative embodiment, the core-shell structure catalyst can be added for mixing after the base polymer, the filler and the cross-linking agent are mixed uniformly. According to the embodiment, the direct contact between the core-shell structure catalyst and the cross-linking agent can be reduced by controlling the adding time of the core-shell structure catalyst, and the production efficiency of the vibrating diaphragm is further ensured. The thickness of the diaphragm of the present invention is 40 μm to 150 μm, and may be, for example, 40 μm, 60 μm, 80 μm, 100 μm, 120 μm, 150 μm, or the like.

Further, the diaphragm is obtained by adding the basic polymer, the filler and the cross-linking agent at 80-180 ℃, uniformly mixing by using a kneader, an open mill or an internal mixer, then adding the core-shell structure catalyst, uniformly mixing at about 25 ℃, and then vulcanizing and molding at 50-100 ℃. The vulcanization temperature may be, for example, 50 ℃, 60 ℃, 70 ℃, 80 ℃, 90 ℃, 100 ℃ or the like.

The vibrating diaphragm provided by the invention comprises at least one layer of silicon rubber film layer, namely the vibrating diaphragm can be of a single-layer structure and can also be a multi-layer composite vibrating diaphragm. Wherein, the single-layer vibrating diaphragm is a vibrating diaphragm formed by a layer of silicon rubber film. The composite diaphragm can be a diaphragm formed by sequentially laminating a plurality of silicon rubber film layers. Or, the composite diaphragm may include at least one silicone rubber film layer and at least one film layer made of other materials. The multilayer film layers can be compounded by adopting conventional modes such as bonding, hot pressing and the like, and the method is not particularly limited.

In a preferred embodiment, when the composite diaphragm is formed by compounding three or more than three layers of films, the silicon rubber films are arranged in the middle, so that the damping of the diaphragm can be improved. In the preparation process of the diaphragm, the raw materials in percentage by weight can be as follows: 30-80% of base polymer, 10-40% of filler, 0.5-20% of cross-linking agent and 0.01-5% of core-shell structure catalyst. Preferably, 30-70% of base polymer, 20-40% of filler, 1-20% of cross-linking agent and 0.5-5% of core-shell structure catalyst. The vibrating diaphragm has excellent performances through the proportion.

The silicon rubber is improved by adding the core-shell structure catalyst formed by the thermoplastic material and the platinum catalyst into the base polymer without adding an inhibitor, wherein the shell softening point of the core-shell structure platinum catalyst is 50-100 ℃; in the heating process, the softening point of the shell is reached, the shell is softened and broken to release the catalyst, and the catalyst is solidified at 50-100 ℃, and because the inhibitor is not contained, after the shell layer is damaged, the catalyst can continue to react in the cooling process after being released, compared with the prior diaphragm made of platinum and the inhibitor or peroxide vulcanized silicone rubber, the diaphragm has the advantages of obviously improved production efficiency, reduced energy consumption and reduced production process loss. In addition, due to the protection of the outer shell layer, the preservation time of the rubber compound is longer on the premise of ensuring low temperature and short-time curing after the catalyst is added, and the preservation time is improved to half a year from the original weeks.

The invention also provides a sound production device which can comprise a vibration system and a magnetic circuit system matched with the vibration system, wherein the vibration system comprises a vibrating diaphragm and a voice coil combined on one side of the vibrating diaphragm. When the sound generating device works, the voice coil can vibrate up and down to drive the vibrating diaphragm to vibrate under the action of the magnetic field force of the magnetic circuit system after being electrified, and the vibrating diaphragm can generate sound during vibration. The sound production device such as a loudspeaker prepared by the vibrating diaphragm can improve the production efficiency, and has better sound production effect.

According to another embodiment of the present invention, as shown in fig. 3 and 4, the sound generating apparatus may include a casing 10, and a magnetic circuit system 20 and a vibration system disposed in the casing 10, where the vibration system may include a voice coil 33, a first diaphragm 31 and a second diaphragm 32, where a top of the voice coil 33 is connected to the first diaphragm 31, the magnetic circuit system 20 drives the voice coil 33 to vibrate to drive the first diaphragm 31 to generate sound, and two ends of the second diaphragm 32 are respectively connected to the casing 10 and a bottom of the voice coil 33. The second diaphragm 32 may be a diaphragm according to the above embodiment of the present invention.

That is, the first diaphragm 31 may be used to vibrate and generate sound, and the second diaphragm 32 may be used to balance the vibration of the voice coil 33. Specifically, when the sound generating device works, after the voice coil 33 is powered on, under the action of the magnetic force of the magnetic circuit system 20, the voice coil 33 can vibrate up and down to drive the first diaphragm 31 to vibrate, and sound can be generated when the first diaphragm 31 vibrates. The second diaphragm 32 can also vibrate up and down along with the voice coil 33, because the two ends of the second diaphragm 32 are connected with the bottom of the casing 10 and the voice coil 33 respectively, the second diaphragm 32 can balance the vibration of the voice coil 33, and can prevent the voice coil 33 from polarizing, thereby improving the sound production effect of the sound production device.

It should be noted that, the first diaphragm 31 and the second diaphragm 32 may both adopt the diaphragms of the above embodiments of the present invention, or one of the first diaphragm 31 and the second diaphragm 32 may adopt the diaphragm of the above embodiments of the present invention, and the present invention is not limited to this specifically.

The invention also provides electronic equipment which comprises the sound production device in the embodiment of the invention.

The technical solution of the present invention will be further explained with reference to the accompanying drawings, specific examples and comparative examples. It will be appreciated that the following description of exemplary embodiments is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses. In comparative examples 1 to 2 and examples 1 to 3 below, methyl vinyl silicone rubber was used as the silicone rubber, and lateral hydrogen-containing silicone oil was used as the crosslinking agent.

Comparative example 1

70g of silicon rubber, 20g of silicon dioxide and 1g of hydrogen-containing silicon oil are vacuumized and mixed uniformly, then 0.6g of dipentaerythritol is added, and the diaphragm is prepared by vulcanization molding at 175 ℃.

The rising and falling temperature curve of the vulcanization of comparative example 1, twenty-two, is shown by reference numeral 1 in fig. 2. In FIG. 2, a → b is the temperature raising section of the mold, b → c is the temperature keeping section, and c → d is the temperature lowering section. As can be seen from fig. 2: the heating section and the cooling section occupy a large amount of time in the production process, and meanwhile, the productivity is low and the process cost is high due to the fact that a large amount of energy is consumed by frequent heating and cooling.

Comparative example 2

70g of silicon rubber, 20g of silicon dioxide and 1g of hydrogen-containing silicon oil are vacuumized and mixed uniformly, then 0.1g of platinum (0) -divinyl tetramethyl disiloxane compound and 0.05g of alkynol inhibitor are added, and the mixture is vulcanized and molded at 140 ℃ to prepare the vibrating diaphragm.

The sulfidation ramping profile of the platinum catalyst containing the inhibitor of this comparative example 2 is shown as reference number 2 in fig. 2. As can be seen from fig. 2, the comparative example uses the platinum catalyst containing the inhibitor to shorten the warming and cooling time to some extent, compared to comparative example 1, but the sulfidation temperature is still at a higher temperature of 140 ℃.

Example 1

1) Preparing a core-shell structure catalyst:

20g of polyethylene wax having a melting point of about 100 ℃ and 10 g of petroleum ether having a boiling point of about 110 ℃ are heated to 115 ℃. Adding 3 g of a platinum (0) -divinyl tetramethyl disiloxane compound with the platinum content of 5000ppm, and uniformly mixing to obtain a solution a for later use. 0.2g of polyvinyl alcohol was added to 40g of water, and the mixture was heated to 55 ℃ and dissolved with stirring to obtain a solution b. The solution a was poured into b, stirred rapidly and heated to 100 ℃. Reducing the temperature to 25 ℃ to obtain a catalyst suspension, filtering and washing the catalyst suspension to obtain the core-shell structure catalyst with the softening point of 100 ℃.

In this embodiment, the core 50 material of the core-shell catalyst is a platinum (0) -divinyltetramethyldisiloxane compound, and the shell 40 material is polyethylene wax; the thickness of the shell 40 of the obtained core-shell structure catalyst is about 5 mu m, and the grain diameter of the core-shell structure is about 15 mu m.

2) Preparing a vibrating diaphragm:

vacuum mixing 70g of silicon rubber, 20g of silicon dioxide and 1g of hydrogen-containing silicone oil uniformly; then adding 0.5g of the core-shell structure catalyst prepared in the step 1), and uniformly mixing; then vulcanizing and molding at 100 ℃ to obtain the vibrating diaphragm.

The temperature rise and fall curve in the whole process of preparing the diaphragm by adopting the core-shell platinum structure catalyst with the softening point of 100 ℃ in the embodiment is shown as a mark 3 in figure 2. As can be seen from fig. 2: compared with the comparative ratio 2, in the process of preparing the diaphragm by adopting the core-shell platinum structure catalyst with the softening point of 100 ℃, the temperature rising and falling time is further shortened, the reaction temperature is further reduced, the production efficiency of the diaphragm is improved, and the energy consumption is reduced.

Example 2

1) Preparing a core-shell structure catalyst:

20g of polyethylene wax having a melting point of about 80 ℃ and 10 g of petroleum ether having a boiling point of about 90 ℃ are heated to 90 ℃. Adding 3 g of a platinum (0) -divinyl tetramethyl disiloxane compound with the platinum content of 5000ppm, and uniformly mixing to obtain a solution a for later use. 0.2g of polyvinyl alcohol was added to 40g of water, and the mixture was heated to 55 ℃ and dissolved with stirring to obtain a solution b. The solution a was poured into b, stirred rapidly and heated to 100 ℃. Reducing the temperature to 25 ℃ to obtain a catalyst suspension, filtering and washing the catalyst suspension to obtain the core-shell structure catalyst with the softening point of 80 ℃.

In this embodiment, the core 50 material of the core-shell catalyst is a platinum (0) -divinyltetramethyldisiloxane compound, and the shell 40 material is polyethylene wax; the thickness of the shell 40 of the obtained core-shell structure catalyst is about 8 mu m, and the grain diameter of the core-shell structure is about 25 mu m.

2) Preparing a vibrating diaphragm:

vacuumizing and uniformly mixing 70g of silicon rubber, 20g of silicon dioxide and 1g of hydrogen-containing silicone oil; then adding 0.5g of the core-shell structure catalyst prepared in the step 1), mixing uniformly, and then vulcanizing and forming at 80 ℃ to obtain the vibrating diaphragm.

The temperature rise and fall curve in the whole process of preparing the diaphragm by adopting the core-shell platinum structure catalyst with the softening point of 80 ℃ in the embodiment is shown as a mark 4 in figure 2. As can be seen from fig. 2: compared with embodiment 1, this embodiment 2 has further reduced reaction temperature, has shortened the time of rising the temperature to further improved vibrating diaphragm production efficiency, reduced the energy consumption.

Example 3

1) Preparing a core-shell structure catalyst:

20g of polyethylene wax having a melting point of about 60 ℃ and 10 g of petroleum ether having a boiling point of about 70 ℃ are heated to 70 ℃. Adding 3 g of a platinum (0) -divinyl tetramethyl disiloxane compound with the platinum content of 5000ppm, and uniformly mixing to obtain a solution a for later use. 0.2g of polyvinyl alcohol was added to 40g of water, and the mixture was heated to 55 ℃ and dissolved with stirring to obtain a solution b. The solution a was poured into b, stirred rapidly and heated to 100 ℃. Reducing the temperature to 25 ℃ to obtain a catalyst suspension, and passing and washing the catalyst suspension to obtain the core-shell structure catalyst with the softening point of 60 ℃.

In this embodiment, the core 50 material of the core-shell catalyst is a platinum (0) -divinyltetramethyldisiloxane compound, and the shell 40 material is polyethylene wax; the thickness of the shell 40 of the obtained core-shell structure catalyst is about 7 mu m, and the grain diameter of the core-shell structure is about 30 mu m.

2) Preparing a vibrating diaphragm:

vacuumizing and uniformly mixing 70g of silicon rubber, 20g of silicon dioxide and 1g of hydrogen-containing silicone oil; then 0.5g of the core-shell structure catalyst in the step 1) is added, the mixture is mixed uniformly, and then the mixture is vulcanized and molded at 60 ℃ to obtain the vibrating diaphragm.

The temperature rise and fall curve in the whole process of preparing the diaphragm by adopting the core-shell platinum structure catalyst with the softening point of 60 ℃ in the embodiment is shown as a reference numeral 5 in figure 2. As can be seen from fig. 2: compared with the embodiment 1 and the embodiment 2, the temperature rise and fall time in the whole manufacturing process of the embodiment 3 is obviously shortened, and the reaction temperature is obviously reduced, so that the production efficiency of the diaphragm is greatly improved, and the energy consumption is greatly reduced.

Compared with the double-pentasulfide and the platinum catalyst containing the inhibitor, the core-shell structure platinum catalyst with the low softening point is adopted to prepare the vibrating diaphragm, so that the temperature rise and fall time of the whole process can be obviously shortened, the reaction temperature is reduced, the energy consumption is reduced, and the production efficiency of the vibrating diaphragm of the loudspeaker can be improved.

The description of the present invention has been presented for purposes of illustration and description, and is not intended to be exhaustive or limited to the invention in the form disclosed. Many modifications and variations will be apparent to practitioners skilled in this art. The embodiment was chosen and described in order to best explain the principles of the invention and the practical application, and to enable others of ordinary skill in the art to understand the invention for various embodiments with various modifications as are suited to the particular use contemplated.