Antistatic sound-absorbing material and its manufacturing method, speakers and electronic devices

Abstract

The present invention provides an antistatic sound absorbing material and a manufacturing method thereof, a speaker, and an electronic device. The antistatic sound absorbing material includes molecular sieve particles, a binder, and an antistatic additive, and the total weight of the molecular sieve particles is 100%, and the antistatic additive is 0.5 to 10%. By mounting the antistatic sound absorbing material provided by the present invention in the back cavity of a speaker of an electronic device, it is possible to solve the problems of aggregation and interface adhesion caused by static electricity accumulation generated by friction and collision between materials, reduce wear, improve the filling amount, and ensure long-term use stability.

Description

[Technical Field]

[0001] The present invention relates to an antistatic sound absorbing material and its manufacturing method, a speaker and an electronic device, which belongs to the technical field of electroacoustic materials, and further to the technical field of improved sound absorbing materials for audio speakers. [Background technology]

[0002] As electronic products become smaller and thinner, the volume of speaker components becomes smaller and smaller. In order to lower the resonance frequency of speakers and improve the low-frequency performance of electronic products, the main solution currently used is to fill the back cavity of the speaker with sound-absorbing particles made of porous material. The main principle is that when the speaker diaphragm moves back and forth, it compresses and decompresses the air in the back cavity, creating pressure fluctuations. The sound-absorbing particles absorb and desorb air using the properties of their porous material, thereby reducing the pressure fluctuations to a certain extent, and virtually increasing the space of the back cavity to reduce the impact of the pressure fluctuations.

[0003] The particle size of sound-absorbing particles currently on the market is generally 100 to 500 μm. When powder particles are rubbed and transported, the electrical balance is destroyed, generating static electricity, which increases the inter-particle force and causes the sound-absorbing particles to clump together or adhere to the surface of equipment, affecting the storage, transportation, and filling processes of the sound-absorbing particles.

[0004] Currently, when using sound-absorbing particles, a plasma blower is typically used to blow plasma air onto the sound-absorbing particles after they have been removed from the package, thereby eliminating static electricity generated during transportation. However, because the sound-absorbing particles are small in volume and lightweight during the filling process, it is not possible to use a plasma blower to blow plasma air onto the sound-absorbing particles. Therefore, there is no effective means of eliminating static electricity generated during transportation on a module filling line. However, the static electricity generated during this process significantly affects the use of the sound-absorbing particles.

[0005] In addition, a certain amount of antistatic agent is added during the molding process of the polymer material to remove static electricity from the material, and the hydrophilic groups in the added antistatic agent enhance the moisture absorption of the material surface and form a conductive film, thereby giving the material antistatic properties. However, most of the conventional antistatic agents currently used are also polymer materials, and the conductive film formed thereby blocks the porous structure of the sound-absorbing particles to some extent, reducing the acoustic improvement effect of the sound-absorbing particles.

[0006] Therefore, providing a new antistatic sound-absorbing material and a manufacturing method thereof, a speaker and an electronic device has become a technical problem that needs to be solved as soon as possible in this field. Summary of the Invention

[0007] The present invention has been made to solve the above-mentioned drawbacks and deficiencies, and one of its objects is to provide an antistatic sound absorbing material.

[0008] Another object of the present invention is to provide a method for producing an antistatic sound absorbing material.

[0009] It is still another object of the present invention to provide a speaker having the above-mentioned anti-static sound absorbing material attached to the back cavity.

[0010] Another object of the present invention is to provide an electronic device having the above-mentioned antistatic sound-absorbing material installed in the back cavity thereof. By installing the antistatic sound-absorbing material provided by the present invention in the back cavity of a speaker of an electronic device, it is possible to solve the problems of aggregation and interfacial adhesion caused by static electricity accumulation between materials, such as particulate antistatic sound-absorbing materials, during transportation, filling, and use, thereby reducing wear during these processes, improving filling amount, and ensuring long-term use stability.

[0011] To achieve the above object, the present invention provides an antistatic sound-absorbing material comprising molecular sieve particles, a binder and an antistatic additive, wherein the total weight of the molecular sieve particles is 100%, and the content of the antistatic additive is 0.5 to 10%.

[0012] In one specific embodiment of the antistatic sound-absorbing material of the present invention, the antistatic additive comprises one or more of graphene, carbon nanotubes, and graphite.

[0013] In the present invention, the fewer the number of graphene layers, the more preferable. In some preferred embodiments of the present invention, the number of graphene layers is 10 or less.

[0014] In one specific embodiment of the antistatic sound absorbing material of the present invention, the carbon nanotubes have an average pore diameter of 5 to 20 nm and an average length at D50 of 1 to 20 μm, preferably 5 to 15 μm.

[0015] In one specific embodiment of the antistatic sound-absorbing material of the present invention, the content of the binder is 4 to 15% when calculated based on the solid content of the binder, with the total weight of the molecular sieve particles being 100%.

[0016] In one specific embodiment of the antistatic sound absorbing material of the present invention, the binder includes an organic binder and / or an inorganic binder.

[0017] In one specific embodiment of the antistatic sound-absorbing material of the present invention, the organic binder comprises one or more of a polyacrylate suspension, a polystyrene acrylate suspension, a polyvinyl acetate suspension, and a polystyrene butadiene suspension.

[0018] In one specific embodiment of the antistatic sound absorbing material of the present invention, the organic binder is contained in an amount of 5 to 12%.

[0019] In one specific embodiment of the antistatic sound-absorbing material of the present invention, the inorganic binder includes one or more of kaolin, silica sol, alumina sol, and carboxymethyl cellulose.

[0020] In one specific embodiment of the antistatic sound absorbing material of the present invention, the inorganic binder is contained in an amount of 5 to 10%.

[0021] In one specific embodiment of the antistatic sound-absorbing material of the present invention, the molecular sieve particles include one or more of MFI, MEL, FER, CHA, IHW, IWV, ITE, UTL, VET, and MTW structural molecular sieves.

[0022] In one specific embodiment of the antistatic sound absorbing material of the present invention, the specific surface area of ​​the molecular sieve particles is 300 m 2 / g or more, and the pore volume is 0.16 to 0.32 cm 3 / g, the molar ratio of silicon oxide / aluminum oxide is more than 200, and the average particle size is 0.1 to 30 μm, preferably 0.5 to 10 μm.

[0023] In one specific embodiment of the antistatic sound absorbing material of the present invention, the molecular sieve particles are ZSM-5 molecular sieve particles.

[0024] In one specific embodiment of the antistatic sound-absorbing material of the present invention, the shape of the antistatic sound-absorbing material includes granular, block, or sheet form.

[0025] In one specific embodiment of the antistatic sound-absorbing material of the present invention, when the antistatic sound-absorbing material is particulate, it has a three-stage pore structure, the size of the first stage pore structure is 0.3 to 0.7 nm, the size of the second stage pore structure is 2 to 30 nm, and the size of the third stage pore structure is 1 to 10 μm.

[0026] In one specific embodiment of the antistatic sound-absorbing material of the present invention, when the antistatic sound-absorbing material is in a particulate form, the bulk density is 0.32 to 0.64 g / mL.

[0027] In one specific embodiment of the antistatic sound-absorbing material of the present invention, when the antistatic sound-absorbing material is in a particulate form, the particle size is 50 to 1000 μm, preferably 100 to 700 μm.

[0028] However, when the antistatic sound-absorbing material is in particulate form, the smaller the particle size, the smaller the bulk density, and the antistatic additive in the antistatic sound-absorbing material significantly improves the phenomenon of aggregation and adhesion. When the antistatic sound-absorbing material is in block or sheet form, the situation in which aggregation and adhesion occur is weaker, and the volume of sheet or block antistatic sound-absorbing material is larger than that of particulate antistatic sound-absorbing material, so the effect of static electricity is not significant, and the antistatic agent added to the material is mainly to improve the situation in which fine particles in the air are adsorbed to the surface of the sheet or block antistatic sound-absorbing material.

[0029] The present invention also provides a method for producing an antistatic sound-absorbing material, which includes mixing raw materials with a solvent and then molding the mixture to produce the antistatic sound-absorbing material, wherein the raw materials include molecular sieve particles, a binder, and an antistatic additive, and the amount of the antistatic additive used is 0.5 to 3% based on the total weight of the molecular sieve particles being 100%.

[0030] In one specific embodiment of the method for producing an antistatic sound-absorbing material of the present invention, the antistatic additive comprises one or more of graphene, carbon nanotubes, and graphite.

[0031] In one specific embodiment of the method for producing an antistatic sound absorbing material of the present invention, the antistatic additive is a powder or a slurry.

[0032] In one specific embodiment of the method for producing an antistatic sound-absorbing material of the present invention, when the antistatic additive is a powder, the amount used is 0.5 to 10%. When the antistatic additive is a slurry, the amount used is 1 to 10%. However, when the antistatic additive is a slurry, the amount used of the antistatic additive is the amount used of the solid content of the slurry.

[0033] In one specific embodiment of the method for producing the antistatic sound-absorbing material of the present invention, when the antistatic additive is a slurry, the solid content thereof is 3 to 10%, preferably 4 to 7%.

[0034] In one specific embodiment of the method for producing the antistatic sound-absorbing material of the present invention, when the antistatic additive is a slurry, the raw material further contains a dispersant, and the amount of the dispersant used is 0.5 to 2% of the total weight of the molecular sieve microparticles, which is 100%.

[0035] In one specific embodiment of the method for producing an antistatic sound-absorbing material of the present invention, the dispersant comprises one or more of a polyglycol ester aqueous solution, an ammonium polycarboxylate aqueous solution, a sodium polycarboxylate aqueous solution, a polyacrylate aqueous solution, and a polyacrylate copolymer, where the polyglycol ester includes, but is not limited to, fatty acid polyethylene glycol, polyethylene glycol oleate, etc.

[0036] In one specific embodiment of the method for producing an antistatic sound-absorbing material of the present invention, the antistatic additive is carbon nanotube powder or carbon nanotube aqueous slurry.

[0037] In one specific embodiment of the method for producing the antistatic sound-absorbing material of the present invention, the pH value of the carbon nanotube aqueous slurry is 6 to 10, and the viscosity is 1000 to 5000 mPa·s, preferably 1000 to 3000 mPa·s.

[0038] In one specific embodiment of the method for producing the antistatic sound-absorbing material of the present invention, the raw material further contains an auxiliary agent, and the amount of the auxiliary agent used is 0.5 to 1.5% based on the total weight of the molecular sieve particles as 100%.

[0039] However, by using an auxiliary agent, the bonding strength between the molecular sieve particles and the binder can be improved, and powder falling off can be reduced.

[0040] In one specific embodiment of the method for producing the antistatic sound-absorbing material of the present invention, the auxiliary agent includes one or more of ethylene glycol, propylene glycol, glycerin, and dimethyl sulfoxide.

[0041] In one specific embodiment of the method for producing an antistatic sound-absorbing material of the present invention, the binder comprises an organic binder and / or an inorganic binder, the solid content of the organic binder is 30 to 60%, and the solid contents of the silica sol and alumina sol in the inorganic binder are each 30 to 50%.

[0042] In one specific embodiment of the method for producing the antistatic sound-absorbing material of the present invention, the solvent includes, but is not limited to, water, and the amount of the solvent used can be selected according to actual needs.

[0043] In one specific embodiment of the method for producing the antistatic sound-absorbing material of the present invention, the molding includes spray granulation, calcination molding, and drying and demolding in a flat mold, and these three molding methods correspond to granular, block, and sheet-shaped antistatic sound-absorbing materials, respectively.

[0044] In one specific embodiment of the method for manufacturing the antistatic sound-absorbing material of the present invention, the antistatic additive is carbon nanotube powder. Taking the granular antistatic sound-absorbing material as an example, the method includes the following specific steps:

[0045] First, molecular sieve particles, water, and carbon nanotube powder are mixed in a mass ratio of 1:0.8-1.5:0.005-0.02, and then the resulting mixture is placed in a sand mill and wet-ground for 10-90 minutes. Then, binders and auxiliary agents are added to the uniformly mixed slurry, which is then spray-granulated to obtain antistatic sound-absorbing particles.

[0046] In one specific embodiment of the method for producing the antistatic sound-absorbing material of the present invention, the antistatic additive is a carbon nanotube slurry. Taking the antistatic sound-absorbing material in particulate form as an example, the method includes the following specific steps:

[0047] First, the molecular sieve particles, water, carbon nanotube slurry, and dispersant were mixed in a mass ratio of 1:0.55-1.25:0.005-0.03:0.005-0.02, and then the resulting mixture was placed in an ultrasonic disperser and ultrasonically dispersed for 40-120 minutes. The mixture was then added to a solution containing a binder and an auxiliary agent, and then spray-granulated to obtain antistatic sound-absorbing particles.

[0048] When carbon nanotube powder is used as the antistatic additive, the carbon nanotube powder and molecular sieve particles are uniformly dispersed by grinding with a sand mill. The advantage of this method is that the molecular sieve particles and carbon nanotubes are ground with the same slurry, resulting in a uniform powder mixture, allowing the carbon nanotubes to adhere better to the surface of the molecular sieve particles, forming a stable system, and the resulting suspension is less likely to aggregate or settle. The loss of carbon nanotubes in the stable system during subsequent filtration and standing is significantly reduced compared to when carbon nanotube slurry is used directly. However, using this method to prepare an antistatic sound-absorbing material does have some impact on the acoustic performance of the resulting antistatic sound-absorbing material. When using carbon nanotube slurry as the antistatic additive to prepare an antistatic sound-absorbing material, compared to when carbon nanotube powder is used as the antistatic additive, the carbon nanotube slurry is dispersed in the molecular sieve particle suspension, and the viscosity of the dispersion is high, resulting in poor bonding between the carbon nanotubes and the molecular sieve particles, making it more susceptible to aggregation and settling.

[0049] Furthermore, the present invention provides a speaker including one or more acoustic sensors and one or more housings, the one or more acoustic sensors and the one or more housings being combined to form a back cavity of the speaker, and the antistatic sound-absorbing material being installed in the back cavity of the speaker.

[0050] Furthermore, the present invention provides an electronic device in which the antistatic sound absorbing material is attached to the back cavity of a speaker of the electronic device.

[0051] In a specific embodiment of the electronic device of the present invention, the electronic device includes a smartphone, a TWS earphone, a headphone, a smart glass, a smart watch, a VR device, an AR device, a tablet, or a thin laptop.

[0052] The beneficial technical effects that the present invention can achieve include the following: (1) The present invention uses a carbon material (such as graphene, carbon nanotubes, or graphite) as an antistatic additive for the antistatic sound-absorbing material. The carbon material itself has a large specific surface area and a certain porosity. Therefore, using the carbon material as an antistatic additive in the sound-absorbing material has little effect on the acoustic effect. Furthermore, its unique pore structure, in combination with the porous structure of the molecular sieve microparticles, further improves the air adsorption / desorption effect. (2) The antistatic sound-absorbing material provided by the present invention is used in the back cavity of a speaker. By adjusting the air pressure changes in the back cavity mainly by absorbing and desorbing air, the low-frequency response of the speaker is improved, and the acoustic performance of the speaker is enhanced. Compared to conventional sound-absorbing materials, the antistatic sound-absorbing material provided by the present invention has a smaller inter-particulate force (attraction), faster frictional charge release, and weaker static buildup, thereby reducing frictional static electricity between the material and other components in the speaker. Particulate antistatic sound-absorbing material has less agglomeration and adhesion in the filling and box module, effectively reducing particle agglomeration and adhesion to the module, improving the filling amount and filling efficiency to a certain extent. The less agglomeration between particles, the better the acoustic improvement effect within the material. The surface of the block or sheet antistatic sound-absorbing material is improved in adsorption of airborne particles, reducing the likelihood of surface clogging. (3) The anti-static sound-absorbing material provided by the present invention can be applied to the back cavities of speakers in products that require miniaturization and thinness, such as smartphones, VR devices, AR devices, and TWS earphones, providing better acoustic performance. [Brief explanation of the drawings]

[0053] In order to more clearly describe the embodiments of the present invention or the technical solutions in the prior art, the drawings required in the description of the embodiments will be briefly described below. It is obvious that the drawings in the following description are some embodiments of the present invention, and those skilled in the art can also obtain other drawings based on these drawings without any creative efforts. [Figure 1] FIG. 1 is a schematic diagram (SEM image) of the morphology of the carbon nanotube powder used in the examples of the present invention. [Figure 2a] Figure 2a is a schematic diagram of the adhesion state of the sound-absorbing particles produced in Comparative Example 1 to the PET film at the box filling port. [Figure 2b] Figure 2b is a schematic diagram of the adhesion of the antistatic sound-absorbing particles produced in Example 1 of the present invention to the PET film at the box filling port. DETAILED DESCRIPTION OF THE INVENTION

[0054] "Ranges" disclosed herein are expressed as lower and upper limits. There may be one or more lower limits and one or more upper limits, respectively. A given range is defined by selecting one lower limit and one upper limit. The selected lower and upper limits define the boundaries of that particular range. All ranges defined in this manner are combinable, and any lower limit can be combined with any upper limit to form a single range. For example, for a particular parameter, ranges of 60 to 120 and 80 to 110 are listed, and it is understood that ranges of 60 to 110 and 80 to 120 are also contemplated. Also, if the minimum range values ​​listed are 1 and 2 and the maximum range values ​​listed are 3, 4, and 5, then the ranges 1 to 3, 1 to 4, 1 to 5, 2 to 3, 2 to 4, and 2 to 5 are all contemplated.

[0055] In the present invention, unless otherwise specified, the numerical range "a to b" is an abbreviation of any combination of real numbers from a to b, where a and b are both real numbers. For example, the numerical range "0 to 5" indicates that all real numbers between "0 and 5" have already been listed in the text, and "0 to 5" is merely an abbreviation of this combination of numerical values.

[0056] In the present invention, unless otherwise specified, all embodiments and preferred embodiments mentioned herein can be combined with each other to form new technical solutions.

[0057] In the present invention, unless otherwise specified, all technical features and preferred technical features mentioned in the present specification can be combined with each other to form new technical solutions.

[0058] In the present invention, unless otherwise specified, the term "comprises" used in the present specification may be either open or closed. For example, the term "comprises" may mean that other materials and / or elements not listed are further included, or that only the listed materials and / or elements are included.

[0059] In order to more clearly understand the technical features, objectives and beneficial effects of the present invention, the technical solutions of the present invention will be described in detail below with reference to the following specific examples, which should not be construed as limiting the scope of the present invention. [Example]

[0060] Example 1 In this embodiment, the antistatic sound-absorbing particles are prepared by the following specific steps:

[0061] 100g of ZSM-5 molecular sieve fine particles, 90g of water, and 0.5g of carbon nanotube powder were mixed uniformly, and the resulting mixture was placed in a sand mill and polished for 30 minutes, after which it was taken out to obtain liquid A.

[0062] The molar ratio of silicon oxide / aluminum oxide of the ZSM-5 molecular sieve particles used here is 425, the pore volume is 0.247 mL / g, the average particle diameter is 1.73 μm, and the specific surface area is 385 m 2 / g.

[0063] The carbon nanotubes used had an average pore size of 5 to 20 nm, and an average particle size, ie, an average length at D50, of ≦10 μm. The carbon nanotubes had a schematic morphology as shown in FIG.

[0064] Liquid B was obtained by uniformly mixing 30 g of water, 15 g of a polystyrene acrylate suspension with a solid content of 40%, and 1 g of propylene glycol.

[0065] Liquid B was added to liquid A to obtain mixed liquid C, which was then filtered using a 400-mesh filter paper and granulated to obtain antistatic sound-absorbing particulate material.

[0066] The antistatic sound-absorbing particulate material produced in this example had an average particle diameter of 364 μm and a bulk density of 0.357 g / mL. In the particles, the total weight of the molecular sieve microparticles was 100%, and the carbon nanotubes were 0.5% and the polystyrene acrylate was 5.98%. [Example]

[0067] Example 2 In this embodiment, the antistatic sound-absorbing particles are prepared by the following specific steps:

[0068] 100g of ZSM-5 molecular sieve fine particles, 90g of water, and 1g of carbon nanotube powder were mixed uniformly, and the resulting mixture was placed in a sand mill and polished for 40 minutes, after which it was taken out to obtain liquid A.

[0069] The molar ratio of silicon oxide / aluminum oxide of the ZSM-5 molecular sieve particles used here was 425, the pore volume was 0.247 mL / g, the average particle diameter was 1.73 μm, and the specific surface area was 385 m 2 / g.

[0070] The carbon nanotubes used had an average pore size of 5 to 20 nm, and their average particle size, ie, average length at D50, was ≦10 μm.

[0071] Liquid B was obtained by uniformly mixing 30 g of water, 15 g of a polystyrene acrylate suspension with a solid content of 40%, and 1 g of propylene glycol.

[0072] Liquid B was added to liquid A to obtain mixed liquid C, which was then filtered using a 400-mesh filter paper and granulated to obtain antistatic sound-absorbing particulate material.

[0073] The antistatic sound-absorbing particulate material produced in this example had an average particle diameter of 366 μm and a bulk density of 0.354 g / mL. In the particles, the total weight of the molecular sieve microparticles was 100%, and the carbon nanotubes were 0.99% and the polystyrene acrylate was 5.99%. [Example]

[0074] Example 3 In this embodiment, the antistatic sound-absorbing particles are prepared by the following specific steps:

[0075] 100g of ZSM-5 molecular sieve fine particles, 90g of water, and 2g of carbon nanotube powder were mixed uniformly, and the resulting mixture was placed in a sand mill, polished for 45 minutes, and then removed to obtain liquid A.

[0076] The molar ratio of silicon oxide / aluminum oxide of the ZSM-5 molecular sieve particles used here was 425, the pore volume was 0.247 mL / g, the average particle diameter was 1.73 μm, and the specific surface area was 385 m 2 / g.

[0077] The carbon nanotubes used had an average pore size of 5 to 20 nm, and their average particle size, ie, average length at D50, was ≦10 μm.

[0078] Liquid B was obtained by uniformly mixing 30 g of water, 15 g of a polystyrene acrylate suspension with a solid content of 40%, and 1 g of propylene glycol.

[0079] Liquid B was added to liquid A to obtain mixed liquid C, which was then filtered using a 400-mesh filter paper and granulated to obtain antistatic sound-absorbing particulate material.

[0080] The antistatic sound-absorbing particulate material produced in this example had an average particle diameter of 362 μm and a bulk density of 0.36 g / mL. In the particles, the total weight of the molecular sieve microparticles was 100%, and the carbon nanotubes were 2% and the polystyrene acrylate was 6%. [Example]

[0081] Example 4 In this embodiment, the antistatic sound-absorbing particles are prepared by the following specific steps:

[0082] 100g of ZSM-5 molecular sieve fine particles, 90g of water, and 3.5g of carbon nanotube powder were mixed uniformly, and the resulting mixture was placed in a sand mill and polished for 50 minutes, after which it was taken out to obtain liquid A.

[0083] The molar ratio of silicon oxide / aluminum oxide of the ZSM-5 molecular sieve particles used here was 425, the pore volume was 0.247 mL / g, the average particle diameter was 1.73 μm, and the specific surface area was 385 m 2 / g.

[0084] The carbon nanotubes used had an average pore size of 5 to 20 nm, and their average particle size, ie, average length at D50, was ≦10 μm.

[0085] Liquid B was obtained by uniformly mixing 30 g of water, 15 g of a polystyrene acrylate suspension with a solid content of 40%, and 1 g of propylene glycol.

[0086] Liquid B was added to liquid A to obtain mixed liquid C, which was then filtered using a 400-mesh filter paper and granulated to obtain the antistatic sound-absorbing particulate material.

[0087] The antistatic sound-absorbing particulate material produced in this example had an average particle size of 366 μm and a bulk density of 0.357 g / mL. In the particles, the total weight of the molecular sieve microparticles was 100%, and the carbon nanotubes were 3.48% and the polystyrene acrylate was 5.89%. [Example]

[0088] Example 5 In this embodiment, an anti-static sound-absorbing block material is provided which is manufactured by the following specific steps:

[0089] 100g of ZSM-5 molecular sieve fine particles, 90g of water, and 0.5g of carbon nanotube powder were mixed uniformly, and the resulting mixture was placed in a sand mill and polished for 30 minutes, after which it was taken out to obtain liquid A.

[0090] The molar ratio of silicon oxide / aluminum oxide of the ZSM-5 molecular sieve particles used here was 425, the pore volume was 0.247 mL / g, the average particle diameter was 1.73 μm, and the specific surface area was 385 m 2 / g.

[0091] The carbon nanotubes used had an average pore size of 5 to 20 nm, and their average particle size, ie, average length at D50, was ≦10 μm.

[0092] 30 g of water, 14 g of silica sol with a solid content of 30%, and 1 g of propylene glycol were mixed uniformly to obtain a solution B.

[0093] Solution B was added to solution A to obtain mixed solution C, which was then filtered using a 400-mesh filter paper and poured into a bulk mold (a conventional facility used in the art) to obtain a 450 o The mixture was sintered at C for 4 hours, molded, and then demolded to obtain the antistatic sound absorbing block material.

[0094] The bulk density of the antistatic sound-absorbing block produced in this example was 0.389 g / mL, and the carbon nanotubes in the block were 0.5% based on the total weight of the molecular sieve particles taken as 100%. [Example]

[0095] Example 6 In this example, an antistatic sound-absorbing sheet material was provided, which was manufactured according to the following specific steps:

[0096] 100g of ZSM-5 molecular sieve fine particles, 90g of water, and 1g of carbon nanotube powder were mixed uniformly, and the resulting mixture was placed in a sand mill and polished for 40 minutes, after which it was taken out to obtain liquid A.

[0097] The molar ratio of silicon oxide / aluminum oxide of the ZSM-5 molecular sieve particles used here was 425, the pore volume was 0.247 mL / g, the average particle diameter was 1.73 μm, and the specific surface area was 385 m 2 / g.

[0098] The carbon nanotubes used had an average pore size of 5 to 20 nm, and their average particle size, ie, average length at D50, was ≦10 μm.

[0099] Liquid B was obtained by uniformly mixing 30 g of water, 15 g of a polystyrene acrylate suspension with a solid content of 40%, and 1 g of propylene glycol.

[0100] Solution B was added to solution A to obtain mixed solution C, which was then filtered using a 400-mesh filter paper and placed in a large flat mold (a conventional facility used in the field). o C for 30 minutes and then released to obtain an antistatic sound absorbing sheet material.

[0101] The antistatic sound-absorbing sheet material produced in this example had an average thickness of 542 μm and a bulk density of 0.532 g / mL. In the sheet material, the total weight of the molecular sieve microparticles was 100%, and the carbon nanotubes were 1% and the polystyrene acrylate was 6%. [Example]

[0102] Example 7 In this embodiment, the antistatic sound-absorbing particles are prepared by the following specific steps:

[0103] 100g of ZSM-5 molecular sieve particles, 80g of water, 20g of carbon nanotube aqueous slurry (solid content 5%), and 1g of fatty acid polyethylene glycol aqueous solution were mixed uniformly and irradiated with ultrasound for 45 minutes to obtain liquid A.

[0104] The molar ratio of silicon oxide / aluminum oxide of the ZSM-5 molecular sieve particles used here was 425, the pore volume was 0.247 mL / g, the average particle diameter was 1.73 μm, and the specific surface area was 385 m 2 / g.

[0105] The carbon nanotubes used had an average pore size of 5 to 20 nm, and their average particle size, ie, average length at D50, was ≦10 μm.

[0106] The pH value of the carbon nanotube aqueous slurry used was 7.2 and the viscosity was 1856 mPa·s.

[0107] Liquid B was obtained by uniformly mixing 20 g of water, 15 g of a polystyrene acrylate suspension with a solid content of 40%, and 1 g of propylene glycol.

[0108] Liquid B was added to liquid A to obtain mixed liquid C, which was then filtered using a 400-mesh filter paper and granulated to obtain antistatic sound-absorbing particulate material.

[0109] The antistatic sound-absorbing particulate material produced in this example had an average particle diameter of 373 μm and a bulk density of 0.355 g / mL. In the particles, the total weight of the molecular sieve microparticles was 100%, and the carbon nanotubes were 0.98% and the polystyrene acrylate was 6%. [Example]

[0110] Example 8 In this embodiment, the antistatic sound-absorbing particles are prepared by the following specific steps:

[0111] 100g of ZSM-5 molecular sieve particles, 70g of water, 40g of carbon nanotube aqueous slurry (solid content 5%), and 1g of fatty acid polyethylene glycol aqueous solution were mixed uniformly and irradiated with ultrasound for 60 minutes to obtain liquid A.

[0112] The molar ratio of silicon oxide / aluminum oxide of the ZSM-5 molecular sieve particles used here was 425, the pore volume was 0.247 mL / g, the average particle diameter was 1.73 μm, and the specific surface area was 385 m 2 / g.

[0113] The carbon nanotubes used had an average pore size of 5 to 20 nm, and their average particle size, ie, average length at D50, was ≦10 μm.

[0114] The pH value of the carbon nanotube aqueous slurry used was 7.2 and the viscosity was 1856 mPa·s.

[0115] Liquid B was obtained by uniformly mixing 20 g of water, 15 g of a polystyrene acrylate suspension with a solid content of 40%, and 1 g of propylene glycol.

[0116] Liquid B was added to liquid A to obtain mixed liquid C, which was then filtered using a 400-mesh filter paper and granulated to obtain antistatic sound-absorbing particulate material.

[0117] The antistatic sound-absorbing particles produced in this example had an average particle size of 377 μm and a bulk density of 0.361 g / mL. The particles contained 1.98% carbon nanotubes and 5.96% polystyrene acrylate, with the total weight of the molecular sieve particles being 100%. [Example]

[0118] Example 9 In this embodiment, the antistatic sound-absorbing particles are prepared by the following specific steps:

[0119] 100g of ZSM-5 molecular sieve particles, 55g of water, 60g of carbon nanotube aqueous slurry (solid content 5%), and 1g of fatty acid polyethylene glycol aqueous solution were mixed uniformly and irradiated with ultrasound for 70 minutes to obtain liquid A.

[0120] The molar ratio of silicon oxide / aluminum oxide of the ZSM-5 molecular sieve particles used here was 425, the pore volume was 0.247 mL / g, the average particle diameter was 1.73 μm, and the specific surface area was 385 m 2 / g.

[0121] The carbon nanotubes used had an average pore size of 5 to 20 nm, and their average particle size, ie, average length at D50, was ≦10 μm.

[0122] The pH value of the carbon nanotube aqueous slurry used was 7.2 and the viscosity was 1856 mPa·s.

[0123] Liquid B was obtained by uniformly mixing 20 g of water, 15 g of a polystyrene acrylate suspension with a solid content of 40%, and 1 g of propylene glycol.

[0124] Liquid B was added to liquid A to obtain mixed liquid C, which was then filtered using a 400-mesh filter paper and granulated to obtain antistatic sound-absorbing particulate material.

[0125] The antistatic sound-absorbing particulate material produced in this example had an average particle diameter of 381 μm and a bulk density of 0.365 g / mL. In the particles, the total weight of the molecular sieve microparticles was 100%, and the carbon nanotubes were 0.98% and the polystyrene acrylate was 6%. [Example]

[0126] Example 10 In this embodiment, the antistatic sound-absorbing particles are prepared by the following specific steps:

[0127] 100g of S-1 molecular sieve particles (MFI structure), 90g of water, and 0.5g of carbon nanotube powder were mixed uniformly, and the resulting mixture was placed in a sand mill and polished for 30 minutes, after which it was taken out to obtain liquid A.

[0128] The carbon nanotubes used herein had an average pore size of 5 to 20 nm, and their average particle size, ie, average length at D50, was ≦10 μm.

[0129] Liquid B was obtained by uniformly mixing 30 g of water, 15 g of a polystyrene acrylate suspension with a solid content of 40%, and 1 g of propylene glycol.

[0130] Liquid B was added to liquid A to obtain mixed liquid C, which was then filtered using a 400-mesh filter paper and granulated to obtain antistatic sound-absorbing particulate material.

[0131] The antistatic sound-absorbing particulate material produced in this example had an average particle diameter of 363 μm and a bulk density of 0.361 g / mL. In the particles, the total weight of the molecular sieve microparticles was 100%, and the carbon nanotubes were 0.5% and the polystyrene acrylate was 5.91%. [Example]

[0132] Example 11 This example provides antistatic sound-absorbing particles, which differ from Example 9 in that 100 g of ZSM-35 molecular sieve particles (FER structure) were used, but the other manufacturing steps were the same. The antistatic sound-absorbing particles produced in this example had an average particle size of 370 μm, a bulk density of 0.365 g / mL, and, based on the total weight of the molecular sieve particles as 100%, carbon nanotubes accounted for 0.5% and polystyrene acrylate for 6%. [Example]

[0133] Example 12 In this embodiment, the antistatic sound-absorbing particles are prepared by the following specific steps:

[0134] 100 g of ZSM-5 molecular sieve particles, 90 g of water, and 0.5 g of graphene powder were mixed uniformly, and the resulting mixture was placed in a sand mill and polished for 30 minutes. Then, the mixture was taken out to obtain liquid A.

[0135] The molar ratio of silicon oxide / aluminum oxide of the ZSM-5 molecular sieve particles used here was 425, the pore volume was 0.247 mL / g, the average particle diameter was 1.73 μm, and the specific surface area was 385 m 2 / g.

[0136] The graphene powder used had an average layer number of 10 layers.

[0137] Liquid B was obtained by uniformly mixing 30 g of water, 15 g of a polystyrene acrylate suspension with a solid content of 40%, and 1 g of propylene glycol.

[0138] Liquid B was added to liquid A to obtain mixed liquid C, which was then filtered using a 400-mesh filter paper and granulated to obtain antistatic sound-absorbing particulate material.

[0139] The antistatic sound-absorbing particulate material produced in this example had an average particle size of 363 μm and a bulk density of 0.361 g / mL. In the particles, graphene accounted for 0.5% and polystyrene acrylate accounted for 6%, based on the total weight of the molecular sieve microparticles being 100%.

[0140] Comparative Example 1 (Comparative Example without Antistatic Additive Carbon Nanotube / Graphene Powder) In this comparative example, sound-absorbing particles were prepared by the following specific steps.

[0141] 100 g of ZSM-5 molecular sieve particles and 90 g of water were uniformly mixed to obtain liquid A.

[0142] The molar ratio of silicon oxide / aluminum oxide of the ZSM-5 molecular sieve particles used here was 425, the pore volume was 0.247 mL / g, the average particle diameter was 1.73 μm, and the specific surface area was 385 m 2 / g.

[0143] Liquid B was obtained by uniformly mixing 30 g of water, 15 g of a polystyrene acrylate suspension with a solid content of 40%, and 1 g of propylene glycol.

[0144] Liquid B was added to liquid A to obtain mixed liquid C, which was then filtered using 400-mesh filter paper and granulated to obtain the sound-absorbing particulate material.

[0145] The sound-absorbing particulate material produced in this comparative example had an average particle size of 365 μm and a bulk density of 0.358 g / mL.

[0146] Comparative Example 2 (Comparative Example in which the amount of carbon nanotube powder used as an antistatic additive is not within the range described in the claims) In this comparative example, the antistatic sound-absorbing particles were prepared by the following specific steps:

[0147] 100g of ZSM-5 molecular sieve fine particles, 90g of water, and 11g of carbon nanotube powder were mixed uniformly, and the resulting mixture was placed in a sand mill and polished for 50 minutes, after which it was taken out to obtain liquid A.

[0148] The molar ratio of silicon oxide / aluminum oxide of the ZSM-5 molecular sieve particles used here was 425, the pore volume was 0.247 mL / g, the average particle diameter was 1.73 μm, and the specific surface area was 385 m 2 / g.

[0149] The carbon nanotubes used had an average pore size of 5 to 20 nm, and their average particle size, ie, average length at D50, was ≦10 μm.

[0150] Liquid B was obtained by uniformly mixing 30 g of water, 15 g of a polystyrene acrylate suspension with a solid content of 40%, and 1 g of propylene glycol.

[0151] Liquid B was added to liquid A to obtain mixed liquid C, which was then filtered using a 400-mesh filter paper and granulated to obtain the antistatic sound-absorbing particulate material.

[0152] The antistatic sound-absorbing particulate material produced in this comparative example had an average particle diameter of 366 μm and a bulk density of 0.357 g / mL. In the particles, the total weight of the molecular sieve microparticles was 100%, and the carbon nanotubes were 10.3% and the polystyrene acrylate was 5.89%.

[0153] Comparative Example 3 (Comparative Example in which the average length of the carbon nanotube powder, which is an antistatic additive, is outside the range described in the claims) In this comparative example, the antistatic sound-absorbing particles were prepared by the following specific steps:

[0154] 100g of ZSM-5 molecular sieve fine particles, 90g of water, and 1g of carbon nanotube powder were mixed uniformly, and the resulting mixture was placed in a sand mill and polished for 40 minutes, after which it was taken out to obtain liquid A.

[0155] The molar ratio of silicon oxide / aluminum oxide of the ZSM-5 molecular sieve particles used here was 425, the pore volume was 0.247 mL / g, the average particle diameter was 1.73 μm, and the specific surface area was 385 m 2 / g.

[0156] The carbon nanotubes used had an average pore size of 5 to 20 nm, and their average particle size, ie, average length at D50, was ≦25 μm.

[0157] Liquid B was obtained by uniformly mixing 30 g of water, 15 g of a polystyrene acrylate suspension with a solid content of 40%, and 1 g of propylene glycol.

[0158] Liquid B was added to liquid A to obtain mixed liquid C, which was then filtered using a 400-mesh filter paper and granulated to obtain the antistatic sound-absorbing particulate material.

[0159] The antistatic sound absorbing particulate material produced in this comparative example had an average particle size of 375 μm and a bulk density of 0.351 g / mL.

[0160] Comparative Example 4 (Comparative Example in which the average length of the carbon nanotube powder, which is an antistatic additive, is outside the range described in the claims) In this comparative example, the antistatic sound-absorbing particles were prepared by the following specific steps:

[0161] 100g of ZSM-5 molecular sieve particles, 90g of water, and 1g of carbon nanotube powder were mixed uniformly, and the resulting mixture was placed in a sand mill and polished for 45 minutes, after which it was taken out to obtain liquid A.

[0162] The molar ratio of silicon oxide / aluminum oxide of the ZSM-5 molecular sieve particles used here was 425, the pore volume was 0.247 mL / g, the average particle diameter was 1.73 μm, and the specific surface area was 385 m 2 / g.

[0163] The carbon nanotubes used had an average pore size of 5 to 20 nm, and their average particle size, ie, average length at D50, was ≦40 μm.

[0164] Liquid B was obtained by uniformly mixing 30 g of water, 15 g of a polystyrene acrylate suspension with a solid content of 40%, and 1 g of propylene glycol.

[0165] Liquid B was added to liquid A to obtain mixed liquid C, which was then filtered using a 400-mesh filter paper and granulated to obtain the antistatic sound-absorbing particulate material.

[0166] The antistatic sound absorbing particulate material produced in this comparative example had an average particle size of 379 μm and a bulk density of 0.349 g / mL.

[0167] Comparative Example 5 (Comparative Example in which the amount of carbon nanotube aqueous slurry used as an antistatic additive is outside the range described in the claims) In this comparative example, the antistatic sound-absorbing particles were prepared by the following specific steps:

[0168] 100g of ZSM-5 molecular sieve particles, 50g of water, 80g of carbon nanotube aqueous slurry (solid content 5%), and 1g of fatty acid polyethylene glycol aqueous solution were mixed uniformly and irradiated with ultrasound for 120min to obtain liquid A.

[0169] The molar ratio of silicon oxide / aluminum oxide of the ZSM-5 molecular sieve particles used here was 425, the pore volume was 0.247 mL / g, the average particle diameter was 1.73 μm, and the specific surface area was 385 m 2 / g.

[0170] The carbon nanotubes used had an average pore size of 5 to 20 nm, and their average particle size, ie, average length at D50, was ≦10 μm.

[0171] The pH value of the carbon nanotube aqueous slurry used was 7.2 and the viscosity was 1856 mPa·s.

[0172] Liquid B was obtained by uniformly mixing 20 g of water, 15 g of a polystyrene acrylate suspension with a solid content of 40%, and 1 g of propylene glycol.

[0173] Liquid B was added to liquid A to obtain mixed liquid C, which was then filtered using a 400-mesh filter paper and granulated to obtain antistatic sound-absorbing particulate material.

[0174] The antistatic sound-absorbing particulate material produced in this comparative example had an average particle diameter of 382 μm and a bulk density of 0.364 g / mL. In the particles, the total weight of the molecular sieve microparticles was 100%, and the carbon nanotubes were 4% and the polystyrene acrylate was 5.91%.

[0175] Comparative Example 6 (Comparative Example of a Different Type of Molecular Sieve Without the Antistatic Additive Carbon Nanotube Powder) In this comparative example, sound-absorbing particles were prepared by the following specific steps.

[0176] 100 g of S-1 molecular sieve particles and 90 g of water were uniformly mixed to obtain solution A.

[0177] Liquid B was obtained by uniformly mixing 30 g of water, 15 g of a polystyrene acrylate suspension with a solid content of 40%, and 1 g of propylene glycol.

[0178] Liquid B was added to liquid A to obtain mixed liquid C, which was then filtered using 400-mesh filter paper and granulated to obtain the sound-absorbing particulate material.

[0179] The sound-absorbing particulate material produced in this comparative example had an average particle size of 365 μm and a bulk density of 0.360 g / mL.

[0180] Comparative Example 7 (Comparative Example of a Different Type of Molecular Sieve Without the Antistatic Additive Carbon Nanotube Powder) This comparative example provides a sound-absorbing particulate material, and is different from Comparative Example 6 in that 100 g of ZSM-35 molecular sieve particles are used, but the other manufacturing steps are the same.

[0181] The sound-absorbing particulate material produced in this comparative example had an average particle size of 370 μm and a bulk density of 0.366 g / mL.

[0182] Comparative Example 8 (Comparative example of sound absorbing block material that does not use carbon nanotube powder as an antistatic additive) In this comparative example, a sound-absorbing block material was provided which was manufactured according to the following specific steps.

[0183] 100 g of ZSM-5 molecular sieve particles and 90 g of water were mixed uniformly, and the resulting mixture was placed in a sand mill, ground for 30 minutes, and then removed to obtain liquid A.

[0184] The molar ratio of silicon oxide / aluminum oxide of the ZSM-5 molecular sieve particles used here was 425, the pore volume was 0.247 mL / g, the average particle diameter was 1.73 μm, and the specific surface area was 385 m 2 / g.

[0185] Liquid B was obtained by uniformly mixing 30 g of water, 12 g of a polystyrene acrylate suspension with a solid content of 30%, and 1 g of propylene glycol.

[0186] Solution B was added to solution A to obtain mixed solution C, which was then filtered using a 400-mesh filter paper and poured into a bulk mold (a conventional facility used in the art) to obtain a 450 o The sound absorbing block was obtained by sintering at C for 4 hours and molding, and then demolding.

[0187] The bulk density of the sound absorbing block material produced in this comparative example was 0.392 g / mL.

[0188] Comparative Example 9 (a comparative example of a sound-absorbing sheet material that does not use carbon nanotube powder as an antistatic additive) In this comparative example, a sound-absorbing sheet material was provided which was manufactured in accordance with the following specific steps.

[0189] 100 g of ZSM-5 molecular sieve particles and 90 g of water were mixed uniformly, and the resulting mixture was placed in a sand mill, ground for 40 minutes, and then removed to obtain liquid A.

[0190] The molar ratio of silicon oxide / aluminum oxide of the ZSM-5 molecular sieve particles used here was 425, the pore volume was 0.247 mL / g, the average particle diameter was 1.73 μm, and the specific surface area was 385 m 2 / g.

[0191] Liquid B was obtained by uniformly mixing 30 g of water, 15 g of a polystyrene acrylate suspension with a solid content of 40%, and 1 g of propylene glycol.

[0192] Solution B was added to solution A to obtain mixed solution C, which was then filtered using a 400-mesh filter paper and placed in a large flat mold (a conventional facility used in the field). o C for 30 minutes and then released to obtain a sound-absorbing sheet material.

[0193] The sound-absorbing sheet material produced in this comparative example had an average thickness of 542 μm and a bulk density of 0.534 g / mL.

[0194] Test Example 1 In this test example, the surface resistance of the antistatic sound-absorbing particulate materials produced in Examples 1 to 4 and 7 to 12, the sound-absorbing particulate materials produced in Comparative Examples 1 and 6 to 7, and the antistatic sound-absorbing particulate materials produced in Comparative Examples 2 to 5 was measured.

[0195] In this test example, the acoustic performance (ΔF0) was measured for speakers in which the antistatic sound-absorbing particulate material manufactured in Examples 1 to 4 and 7 to 12, the sound-absorbing particulate material manufactured in Comparison Examples 1 and 6 to 7, and the antistatic sound-absorbing particulate material manufactured in Comparison Examples 2 to 5 were installed in the back cavity.

[0196] Here, the measurements are all performed by methods commonly used in the art. For example, the specific measurement method for acoustic performance can be performed by referring to the method of "electrical impedance measurement" set forth in paragraphs 0049 to 0054 of Chinese Patent CN105049997A. Specifically, the method of "electrical impedance measurement" is used to measure each speaker to obtain an electrical impedance spectrum. The curve in the electrical impedance spectrum corresponds to the electrical impedance curve, where the frequency corresponding to the highest point on the electrical impedance curve is F0. When the speaker is not equipped with antistatic sound-absorbing particles or sound-absorbing particles, the measured F0 can be expressed as F. 0~キャビティ When the speaker is fitted with antistatic sound-absorbing particles or sound-absorbing particles, the measured F0 is calculated as F 0~サンプル又はリファレンス Then, the calculation formula for ΔF0 is as follows:

[0197] ΔF0=F 0~キャビティ -F 0~サンプル或リファレンス .

[0198] In this test example, the acoustic performance measurement environment is a standard acoustic test module with a back cavity of (1) cc and a test fill volume of 0.35 cc.

[0199] Surface resistance measurement is done by BEIJING The measurement was carried out using a BEST-212 type smart volume surface resistivity meter manufactured by BEIGUANG JINGYI INSTRUMENT EQUIPMENT CO., LTD, and the measurement voltage was 100V.

[0200] The surface resistance measurement results and acoustic performance (ΔF0) measurement results obtained in this test example are shown in Tables 1, 2, 3 and 4.

[0201] [Table 1] As can be seen from Table 1 above, the addition of carbon nanotube powder and carbon nanotube aqueous slurry significantly reduces the surface resistance of the manufactured sound-absorbing particles. Here, given the same solid loading, the reduction in surface resistance of sound-absorbing particles manufactured using carbon nanotube powder as an antistatic additive is more significant than that of sound-absorbing particles manufactured using carbon nanotube aqueous slurry as an antistatic additive. This is for the following reasons: In this method, the carbon nanotube powder is uniformly mixed with the molecular sieve particles in the same slurry by grinding, allowing the carbon nanotubes to adhere well to the surface of the molecular sieve particles, forming a stable system. The suspension prepared by mixing the resulting mixture with binders and additives also has good dispersibility, with little tendency to agglomeration or sedimentation. Furthermore, during subsequent filtration and storage, the loss of carbon nanotubes in the stable system is significantly reduced compared to when carbon nanotube slurry is used directly. When antistatic sound-absorbing materials are manufactured using carbon nanotube slurry as an antistatic additive, the carbon nanotube slurry is dispersed in a molecular sieve particle suspension, resulting in high viscosity and poor bonding between the carbon nanotubes and the molecular sieve particles, leading to a tendency for aggregation and sedimentation, poor stability, and significant loss of carbon nanotubes during subsequent filtration and storage. However, during the polishing process, a large amount of carbon nanotube powder adheres to the surface of the molecular sieve particles, affecting the pores of the molded sound-absorbing particles. At the same solid loading, the acoustic performance (ΔF0) of sound-absorbing particles manufactured using an aqueous carbon nanotube slurry as an antistatic additive is superior to that of sound-absorbing particles manufactured using carbon nanotube powder as an antistatic additive.

[0202] As can be seen from Table 1 above, in Comparative Example 1, Example 1, Example 2, Example 3, and Comparative Example 2, the surface resistance of the sound-absorbing particulate material decreases as the amount of carbon nanotube powder added increases. This proves that the antistatic performance of the sound-absorbing particulate material is significantly improved, but as the amount of carbon nanotube powder added increases, the acoustic performance (ΔF0) of the produced sound-absorbing particulate material is also affected to some extent. When the amount of carbon nanotube powder added is 3.5%, the acoustic performance (ΔF0) attenuates significantly, exceeding 10 Hz. When the amount of carbon nanotube powder added is 11%, the acoustic performance (ΔF0) attenuates further, approaching 40 Hz.

[0203] As can be seen from Table 1 above, in Example 2, Comparative Example 3, and Comparative Example 4, the surface resistance of the manufactured sound-absorbing particulate material decreases as the average particle diameter of the carbon nanotube powder increases. This proves that the longer the carbon nanotubes, which are antistatic additives, the more advantageous they are for dissipating static electricity. However, the longer the average particle diameter of the carbon nanotubes, which are antistatic additives, the greater the impact on the surface pores of the manufactured sound-absorbing particulate material, thereby reducing the acoustic performance (ΔF0) of the sound-absorbing particulate material.

[0204] As can be seen from Table 1 above, in Comparative Example 1, Example 7, Example 8, Example 9, and Comparative Example 5, as the amount of carbon nanotube slurry (solid content) added increases, the surface resistance of the manufactured sound-absorbing particulate material decreases, but as the amount of carbon nanotube slurry added increases, the acoustic performance (ΔF0) of the manufactured sound-absorbing particulate material also decreases. When the amount of carbon nanotube slurry (solid content) added reaches 4%, the decrease in acoustic performance (ΔF0) becomes quite significant.

[0205] [Table 2] As can be seen from Table 2 above, when carbon nanotube powder is used as an antistatic additive for sound-absorbing particulate materials manufactured using different molecular sieve microparticles, the surface resistance of the sound-absorbing particulate materials is significantly reduced, and the antistatic additive has little effect on the acoustic performance (ΔF0) of the sound-absorbing particulate materials.

[0206] [Table 3] As can be seen from Table 3 above, when carbon nanotube powder and graphene are used as antistatic additives, both significantly reduce the surface resistance of the manufactured sound-absorbing particulate material. However, assuming other manufacturing conditions are approximately the same, the surface resistance of the antistatic sound-absorbing particulate material manufactured using carbon nanotube powder as an antistatic additive is lower than that of the antistatic sound-absorbing particulate material manufactured using graphene as an antistatic additive. In addition, the acoustic performance (ΔF0) of the antistatic sound-absorbing particulate material manufactured using carbon nanotube powder as an antistatic additive is superior to that of the antistatic sound-absorbing particulate material manufactured using graphene as an antistatic additive.

[0207] [Table 4] As can be seen from Table 4 above, regardless of whether the antistatic sound-absorbing material is in the form of particles, lumps, or sheets, when carbon nanotube powder is used as an antistatic additive, the surface resistance of the sound-absorbing particulate material is significantly reduced. Furthermore, regardless of the form of the antistatic sound-absorbing material, adding carbon nanotube powder as an antistatic additive has little effect on its acoustic performance (ΔF0).

[0208] Test Example 2 In this test example, the yield rates of the antistatic sound-absorbing particles produced in Examples 1 to 4 and 7 to 12, the sound-absorbing particles produced in Comparative Examples 1, 6 and 7, and the antistatic sound-absorbing particles produced in Comparative Examples 2 to 5 were determined using conventional methods in the field, and the experimental results obtained are shown in Table 5. The specific process for determining the yield rate of the material includes the following: After the fine particles are formed into particles, the particles must be sieved (to control the particle size) and sorted (to sort the crushed powder) to select the non-defective products. Note that the particles that are sieved are all particles with particle sizes that are too large or too small, and such particles are generally irregularly shaped particles. In the sorting step, particles with cracked surfaces are treated as defective crushed powder, and the remaining powder is considered to be non-defective.

[0209] [Table 5] As can be seen from Table 5 above, as the amount of carbon nanotube powder added increases, the yield rate of the resulting product decreases. This is mainly because the carbon nanotube powder generates more irregular-shaped particles and crushed powder. As the average particle size of the carbon nanotube powder increases, the proportion of irregular-shaped particles in the resulting product increases significantly. This is because the longer the length of the carbon nanotube powder, the more uneven its distribution within the particle, resulting in poor sphericity of the resulting particles.

[0210] As can be seen from Table 5 above, the yield rate of sound-absorbing particles produced using aqueous carbon nanotube slurry as an antistatic additive is lower than that of sound-absorbing particles produced using carbon nanotube powder as an antistatic additive, assuming the same solid loading. This is because the viscosity of the aqueous carbon nanotube slurry is high, and the viscosity of the mixed system increases as the amount of aqueous carbon nanotube slurry added increases, making granulation and dispersion more difficult and resulting in more irregularly shaped particles and crushed powder.

[0211] Test Example 3 In this test example, the filling amount of speakers in which the antistatic sound-absorbing particulate material manufactured in Examples 1 to 4 and the sound-absorbing particulate material manufactured in Comparison Example 1 were installed in the back cavity was measured, and the measurement results obtained are shown in Table 6.

[0212] Measurement environment for this test example: The volume of the cavity (back cavity) of the speaker module used for filling is 0.2 cc, and the duration of the filling funnel is 10 seconds.

[0213] [Table 6] As can be seen from Table 6 above, with an increase in the amount of antistatic additive added, the loading amount of sound-absorbing particles under certain conditions gradually increases, but with the decrease in static electricity on the surface of the sound-absorbing particles, the relationship between the static electricity improvement effect and the increase in loading amount is not a linear trend.

[0214] Test Example 4 In this test example, we investigated the adhesion of the sound-absorbing particles produced in Comparative Example 1 and the antistatic sound-absorbing particles produced in Example 1 of the present invention to the PET film at the box filling port. Figure 2a shows a schematic diagram of the adhesion of the sound-absorbing particles produced in Comparative Example 1 to the PET film at the box filling port, and Figure 2b shows a schematic diagram of the adhesion of the antistatic sound-absorbing particles produced in Example 1 of the present invention to the PET film at the box filling port.

[0215] As can be seen from Figures 2a and 2b, the adhesion of the antistatic sound-absorbing particles prepared with the addition of the antistatic additive in Example 1 of the present invention to the PET film at the box filling port is significantly better than that of the sound-absorbing particles prepared in Comparative Example 1. This proves that the static electricity of the antistatic sound-absorbing particles is effectively released.

[0216] The above description is merely a specific embodiment of the present invention and cannot limit the scope of the invention, so that the replacement of equivalent components or equivalent changes and modifications made based on the patent scope of the present invention should all be included in the scope of the present invention. In addition, the technical features of the present invention can be freely combined with each other, or with technical inventions, or with technical inventions.

Claims

1. An antistatic sound-absorbing material comprising molecular sieve particles, a binder, and an antistatic additive, wherein the total weight of the molecular sieve particles is 100%, and the antistatic additive is 0.5 to 10%. The antistatic additive is carbon nanotubes, and the carbon nanotubes have an average pore size of 5 to 20 nm and an average length at D50 of 1 to 20 μm.

2. 2. The antistatic sound-absorbing material according to claim 1, wherein the carbon nanotubes have an average pore diameter of 5 to 20 nm and an average length at D50 of 5 to 15 μm.

3. The antistatic sound-absorbing material according to claim 1, characterized in that the content of the binder is 4 to 15% when calculated based on the solid content of the binder, with the total weight of the molecular sieve particles being 100%.

4. 4. The antistatic sound-absorbing material according to claim 3, wherein the binder comprises an organic binder and / or an inorganic binder.

5. 5. The antistatic sound-absorbing material according to claim 4, wherein the organic binder comprises one or more of a polyacrylate suspension, a polystyrene acrylate suspension, a polyvinyl acetate suspension, and a polystyrene butadiene suspension.

6. 6. The antistatic sound absorbing material according to claim 5, wherein the organic binder is present in an amount of 5 to 12%.

7. 5. The antistatic sound-absorbing material according to claim 4, wherein the inorganic binder comprises one or more of kaolin, silica sol, alumina sol, and carboxymethyl cellulose.

8. 8. The antistatic sound absorbing material according to claim 7, wherein the inorganic binder is present in an amount of 5 to 10%.

9. 2. The antistatic sound-absorbing material according to claim 1, wherein the molecular sieve particles include one or more of MFI, MEL, FER, CHA, IHW, IWV, ITE, UTL, VET, and MTW structural molecular sieves.

10. The specific surface area of ​​the molecular sieve particles is 300 m ２ / g or more, and the pore volume is 0.16 to 0.32 cm ３ / g, the molar ratio of silicon oxide / aluminum oxide is more than 200, and the average particle size is 0.1 to 30 μm.

11. 11. The antistatic sound absorbing material according to claim 10, wherein the molecular sieve fine particles have an average particle size of 0.5 to 10 μm.

12. 10. The antistatic sound absorbing material according to claim 9, wherein the molecular sieve particles are ZSM-5 molecular sieve particles.

13. 2. The antistatic sound-absorbing material according to claim 1, wherein the antistatic sound-absorbing material is in the form of particles, blocks, or sheets.

14. The antistatic sound-absorbing material according to claim 13, characterized in that when the antistatic sound-absorbing material is particulate, it has a three-stage pore structure, the size of the first stage pore structure is 0.3 to 0.7 nm, the size of the second stage pore structure is 2 to 30 nm, and the size of the third stage pore structure is 1 to 10 μm.

15. A method for producing an antistatic sound-absorbing material, comprising mixing a raw material with a solvent and then molding the mixture to produce an antistatic sound-absorbing material, wherein the raw material comprises molecular sieve particles, a binder, and an antistatic additive, and the amount of the antistatic additive used is 0.5 to 10% based on the total weight of the molecular sieve particles being 100%, and the antistatic additive is carbon nanotubes, and the carbon nanotubes have an average pore diameter of 5 to 20 nm and an average length at D50 of 1 to 20 μm.

16. 16. The method for manufacturing an antistatic sound absorbing material according to claim 15, wherein the antistatic additive is a powder or a slurry.

17. When the antistatic additive is a powder, the amount used is 0.5 to 10%; 17. The method for producing an antistatic sound-absorbing material according to claim 16, wherein when the antistatic additive is a slurry, the amount used is 1 to 10%, and when the antistatic additive is a slurry, the amount used of the antistatic additive is the amount used of the solid content of the slurry.

18. 17. The method for producing an antistatic sound absorbing material according to claim 16, wherein the antistatic additive is in the form of a slurry, the solid content of which is 3-10%.

19. 19. The method for producing an antistatic sound absorbing material according to claim 18, wherein the antistatic additive is in the form of a slurry, and the solid content thereof is 4-7%.

20. 17. The method for manufacturing an antistatic sound-absorbing material according to claim 16, wherein the antistatic additive is a slurry, and the raw material further comprises a dispersant, and the amount of the dispersant used is 0.5 to 2% based on the total weight of the molecular sieve particles as 100%.

21. 21. The method for producing an antistatic sound-absorbing material according to claim 20, wherein the dispersing agent comprises one or more of a polyglycol ester aqueous solution, a polycarboxylic acid ammonium salt aqueous solution, a polycarboxylic acid sodium salt aqueous solution, a polyacrylate aqueous solution, and a polyacrylate copolymer.

22. 16. The method for manufacturing an antistatic sound-absorbing material according to claim 15, wherein the antistatic additive is carbon nanotube powder or carbon nanotube aqueous slurry.

23. 23. The method for manufacturing an antistatic sound-absorbing material according to claim 22, wherein the pH value of the carbon nanotube aqueous slurry is 6 to 10, and the viscosity is 1000 to 5000 mPa·s.

24. 24. The method for manufacturing an antistatic sound-absorbing material according to claim 23, wherein the viscosity of the carbon nanotube aqueous slurry is 1000 to 3000 mPa·s.

25. The method for manufacturing an antistatic sound-absorbing material according to claim 15, characterized in that the raw material further comprises an auxiliary agent, and the amount of the auxiliary agent is 0.5 to 1.5% based on the total weight of the molecular sieve particles being 100%.

26. 26. The method for manufacturing an antistatic sound absorbing material according to claim 25, wherein the auxiliary agent comprises one or more of ethylene glycol, propylene glycol, glycerin, and dimethyl sulfoxide.

27. The method for manufacturing an antistatic sound-absorbing material according to claim 15, characterized in that the binder comprises an organic binder and / or an inorganic binder, the solid content of the organic binder is 30 to 60%, and the solid contents of the silica sol and alumina sol in the inorganic binder are each 30 to 50%.

28. A speaker comprising one or more acoustic sensors and one or more housings, the one or more acoustic sensors combined with the one or more housings forming a back cavity of the speaker, the speaker characterized in that the antistatic sound-absorbing material according to claim 1 is attached to the back cavity of the speaker.

29. 10. An electronic device comprising the antistatic sound absorbing material according to claim 1 attached to a back cavity of a speaker of the electronic device.

30. 30. The electronic device of claim 29, comprising a smartphone, a TWS earphone, a headphone, smart glasses, a smart watch, a VR device, an AR device, a tablet, or a thin laptop.

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