CN114149198A - Particle sound absorption board and preparation method thereof - Google Patents
Particle sound absorption board and preparation method thereof Download PDFInfo
- Publication number
- CN114149198A CN114149198A CN202111452360.1A CN202111452360A CN114149198A CN 114149198 A CN114149198 A CN 114149198A CN 202111452360 A CN202111452360 A CN 202111452360A CN 114149198 A CN114149198 A CN 114149198A
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- particles
- sound absorption
- calcium oxide
- grid cloth
- silicon dioxide
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- 239000002245 particle Substances 0.000 title claims abstract description 106
- 238000010521 absorption reaction Methods 0.000 title claims abstract description 62
- 238000002360 preparation method Methods 0.000 title abstract description 5
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 75
- 239000004744 fabric Substances 0.000 claims abstract description 44
- 239000004576 sand Substances 0.000 claims abstract description 27
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 claims abstract description 24
- 239000000292 calcium oxide Substances 0.000 claims abstract description 24
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims abstract description 24
- 229920000642 polymer Polymers 0.000 claims abstract description 24
- 239000000377 silicon dioxide Substances 0.000 claims abstract description 24
- 235000012239 silicon dioxide Nutrition 0.000 claims abstract description 21
- 238000011049 filling Methods 0.000 claims abstract description 13
- 239000011230 binding agent Substances 0.000 claims abstract description 8
- 230000001788 irregular Effects 0.000 claims abstract description 7
- 239000002994 raw material Substances 0.000 claims description 26
- 239000003822 epoxy resin Substances 0.000 claims description 24
- 229920000647 polyepoxide Polymers 0.000 claims description 24
- 238000003756 stirring Methods 0.000 claims description 20
- 239000000203 mixture Substances 0.000 claims description 15
- 238000007789 sealing Methods 0.000 claims description 15
- 238000001035 drying Methods 0.000 claims description 10
- 238000002156 mixing Methods 0.000 claims description 10
- 238000005507 spraying Methods 0.000 claims description 10
- 238000005303 weighing Methods 0.000 claims description 10
- 238000004519 manufacturing process Methods 0.000 claims description 8
- 238000000034 method Methods 0.000 claims description 7
- 239000000853 adhesive Substances 0.000 claims description 6
- 230000001070 adhesive effect Effects 0.000 claims description 6
- 239000003795 chemical substances by application Substances 0.000 claims description 5
- 239000007888 film coating Substances 0.000 claims description 5
- 238000009501 film coating Methods 0.000 claims description 5
- 238000000465 moulding Methods 0.000 claims description 5
- 239000012856 weighed raw material Substances 0.000 claims description 5
- 239000000945 filler Substances 0.000 claims description 4
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 239000000463 material Substances 0.000 description 10
- 230000000694 effects Effects 0.000 description 6
- 239000011148 porous material Substances 0.000 description 3
- QNRATNLHPGXHMA-XZHTYLCXSA-N (r)-(6-ethoxyquinolin-4-yl)-[(2s,4s,5r)-5-ethyl-1-azabicyclo[2.2.2]octan-2-yl]methanol;hydrochloride Chemical compound Cl.C([C@H]([C@H](C1)CC)C2)CN1[C@@H]2[C@H](O)C1=CC=NC2=CC=C(OCC)C=C21 QNRATNLHPGXHMA-XZHTYLCXSA-N 0.000 description 2
- 239000011449 brick Substances 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 239000002657 fibrous material Substances 0.000 description 1
- 239000011491 glass wool Substances 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 239000011490 mineral wool Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 239000011505 plaster Substances 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B26/00—Compositions of mortars, concrete or artificial stone, containing only organic binders, e.g. polymer or resin concrete
- C04B26/02—Macromolecular compounds
- C04B26/10—Macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
- C04B26/14—Polyepoxides
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C67/00—Shaping techniques not covered by groups B29C39/00 - B29C65/00, B29C70/00 or B29C73/00
- B29C67/24—Shaping techniques not covered by groups B29C39/00 - B29C65/00, B29C70/00 or B29C73/00 characterised by the choice of material
- B29C67/248—Moulding mineral fibres or particles bonded with resin, e.g. for insulating or roofing board
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/62—Insulation or other protection; Elements or use of specified material therefor
- E04B1/74—Heat, sound or noise insulation, absorption, or reflection; Other building methods affording favourable thermal or acoustical conditions, e.g. accumulating of heat within walls
- E04B1/82—Heat, sound or noise insulation, absorption, or reflection; Other building methods affording favourable thermal or acoustical conditions, e.g. accumulating of heat within walls specifically with respect to sound only
- E04B1/84—Sound-absorbing elements
- E04B1/86—Sound-absorbing elements slab-shaped
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/52—Sound-insulating materials
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Chemical & Material Sciences (AREA)
- Acoustics & Sound (AREA)
- Structural Engineering (AREA)
- Ceramic Engineering (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Electromagnetism (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Soundproofing, Sound Blocking, And Sound Damping (AREA)
Abstract
The invention discloses a particle sound absorption plate and a preparation method thereof, the particle sound absorption plate comprises a binder, sound absorption particles, grid cloth and a sound absorption plate body, the surface of the sound absorption particles is covered with a layer of the binder, the sound absorption particles comprise filling particles, framework particles, aeolian sand and sand grains, the framework particles and the filling particles are both composed of round calcium oxide and silicon dioxide polymer particles, the grid cloth is arranged inside the sound absorption plate body, and the particle sound absorption plate has the beneficial effects that: the sound absorption particles comprise skeleton particles of round calcium oxide and silicon dioxide polymer particles and natural irregular polyhedral diamond-shaped filling particles of sand particles, because the irregular polyhedral diamond-shaped characteristic of the natural sand particles is skillfully divided and assembled by the round calcium oxide and silicon dioxide polymer particles to fill gaps with different specifications and shapes, and the sound absorption coefficient NRC is 0.7-0.95.
Description
Technical Field
The invention relates to the technical field of sound absorption plates, in particular to a particle sound absorption plate and a preparation method thereof.
Background
The sound absorption material is a material having an absorption effect on incident sound energy by virtue of its own porosity, membrane effect or resonance effect, and can be divided into two major categories, namely a porous sound absorption material and a resonance sound absorption structure, according to its physical properties and sound absorption modes. The porous sound absorption material is characterized in that a large number of mutually-through micropores which are opened outwards are formed in the material, the sound absorption principle is that after sound waves enter pores of the material, air in the pores and fine fibers of the material vibrate to cause friction and viscous resistance, the sound energy is converted into heat energy to be absorbed, and the porous sound absorption material is widely used in engineering and comprises two types of fiber materials and plaster materials. The former includes glass wool and slag wool or various sound-absorbing boards or sound-absorbing members made of the materials as main raw materials; the latter includes microporous bricks, granular slag sound-absorbing bricks, and the like.
The invention aims to provide a particle sound absorption board and a preparation method thereof, aiming at overcoming the defects of the prior art, and the particle sound absorption board can improve the sound absorption coefficient of the sound absorption board while ensuring the structural strength of the sound absorption board, so as to obtain better sound absorption effect.
For example, patent application No. 201410347735.1 discloses a particulate sound absorbing panel, which uses sand grains of 0.8-1mm size as framework sound absorbing particles, sand grains of 0.1-0.2mm size as filler particles, and a layer of adhesive is coated on the outer surface of the sound absorbing panel, and the angle coefficient of the sound absorbing particles coated with the adhesive is less than 1.3; the sound absorption particles comprise skeleton particles and filling particles, the skeleton particles form a sound absorption plate skeleton, and the filling particles enter pores among the skeleton particles to form sound absorption gaps. Since large particles act as framework particles and small particles act as filler particles in this way, large-area voids are closed, thus reducing the sound absorption effect.
The above-mentioned deficiencies still remain worth improving.
Disclosure of Invention
The present invention is directed to a particle sound absorption board and a method for manufacturing the same, which solves the above problems of the related art.
In order to achieve the purpose, the invention provides the following technical scheme: a particle sound absorption plate comprises a binder, sound absorption particles, grid cloth and a sound absorption plate body, wherein the surface of the sound absorption particles is covered with a layer of the binder, the sound absorption particles comprise filling particles, framework particles, aeolian sand and sand grains, the framework particles and the filling particles are both composed of round calcium oxide and silicon dioxide polymer particles, and the grid cloth is arranged inside the sound absorption plate body.
As a preferred embodiment of the present invention: the size of the round-grain calcium oxide is 30-80 meshes.
As a preferred embodiment of the present invention: the silica polymer has a size of 30-80 mesh.
As a preferred embodiment of the present invention: the mesh cloth is composed of round calcium oxide particles and silicon dioxide polymer particles.
As a preferred embodiment of the present invention: the size of the mesh cloth is 5 x 5 mm.
As a preferred embodiment of the present invention: the adhesive is modified two-component epoxy resin.
As a preferred embodiment of the present invention: the sand grains are natural irregular multi-faced diamond-shaped filling grains.
A method for preparing a particle sound absorption board comprises the following steps:
s1, mixing raw materials: weighing round calcium oxide, silicon dioxide polymer particles, aeolian sand and sand grains, and mixing and stirring the raw materials;
s2, film coating treatment: placing the mixed raw material obtained in the step S1 into a sealing device, stirring the mixed raw material inside the sealing device, and uniformly spraying modified two-component epoxy resin, so that the top of the suction plate is coated with a layer of modified two-component epoxy resin, fixing the particle raw material through the modified two-component epoxy resin, and drying to obtain coated particles;
s3, manufacturing mesh cloth: weighing round calcium oxide and silicon dioxide polymer particles, pouring the weighed raw materials into a 5 x 5mm grid cloth mold, putting the grid cloth mold into sealing equipment, spraying modified two-component epoxy resin, drying, and taking down the grid cloth in the grid cloth mold;
s4, molding: and (4) adding a curing agent into the coated particles obtained in the step (S2) and the mesh cloth, fully stirring, pouring the mixture into a mold after stirring, pouring the mixture into the mold, standing and forming, and taking out the mixture.
Compared with the prior art, the invention has the beneficial effects that: the sound absorption board is simple in structure, novel and strong in practicability, the sound absorption particles comprise framework particles of round calcium oxide and silicon dioxide polymer particles and sand particle natural irregular multi-face rhombic filling particles, gaps in different specifications and shapes are ingeniously formed and filled by the round calcium oxide and silicon dioxide polymer particles due to the characteristic of the irregular multi-face rhombic shape of the natural sand particles, the sound absorption coefficient NRC is 0.7-0.95, and the grid cloth is added in the middle of the sound absorption board to increase the overall strength, so that the sound absorption board is safer and more durable in practical use and construction, and the adhesive adopts modified two-component epoxy resin to improve the stability of the sound absorption board.
Drawings
FIG. 1 is a schematic view of the internal structure of the present invention.
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. 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.
Referring to fig. 1, the present invention provides a technical solution: a particle sound absorption plate comprises a binder, sound absorption particles, grid cloth and a sound absorption plate body, wherein the surface of the sound absorption particles is covered with a layer of the binder, the sound absorption particles comprise filling particles, framework particles, aeolian sand and sand grains, the framework particles and the filling particles are both composed of round calcium oxide and silicon dioxide polymer particles, and the grid cloth is arranged inside the sound absorption plate body.
Wherein the size of the round calcium oxide is 30-80 meshes.
Wherein the silica polymer has a size of 30-80 mesh.
Wherein, the net cloth is composed of round calcium oxide and silicon dioxide polymer particles, thereby increasing the overall strength and being safer and more durable in practicality and construction.
Wherein, the size of the grid cloth is 5 x 5 mm.
The adhesive is modified two-component epoxy resin, so that the stability of fixing the sound absorption plate is improved.
Wherein, the sand grains are natural irregular multi-face rhombus filling grains, and are ingeniously divided and assembled to fill gaps with different specifications and shapes, thereby improving the sound absorption effect.
A method for preparing a particle sound absorption board comprises the following steps:
s1, mixing raw materials: weighing round calcium oxide, silicon dioxide polymer particles, aeolian sand and sand grains, and mixing and stirring the raw materials;
s2, film coating treatment: placing the mixed raw material obtained in the step S1 into a sealing device, stirring the mixed raw material inside the sealing device, and uniformly spraying modified two-component epoxy resin, so that the top of the suction plate is coated with a layer of modified two-component epoxy resin, fixing the particle raw material through the modified two-component epoxy resin, and drying to obtain coated particles;
s3, manufacturing mesh cloth: weighing round calcium oxide and silicon dioxide polymer particles, pouring the weighed raw materials into a 5 x 5mm grid cloth mold, putting the grid cloth mold into sealing equipment, spraying modified two-component epoxy resin, drying, and taking down the grid cloth in the grid cloth mold;
s4, molding: and (4) adding a curing agent into the coated particles obtained in the step (S2) and the mesh cloth, fully stirring, pouring the mixture into a mold after stirring, pouring the mixture into the mold, standing and forming, and taking out the mixture.
Embodiment 1, a method for manufacturing a particulate acoustic panel, comprising the steps of:
s1, mixing raw materials: weighing 30-mesh round calcium oxide, 30-mesh silicon dioxide polymer particles, aeolian sand and sand grains, and mixing and stirring the raw materials;
s2, film coating treatment: placing the mixed raw material obtained in the step S1 into a sealing device, stirring the mixed raw material inside the sealing device, and uniformly spraying modified two-component epoxy resin, so that the top of the suction plate is coated with a layer of modified two-component epoxy resin, fixing the particle raw material through the modified two-component epoxy resin, and drying to obtain coated particles;
s3, manufacturing mesh cloth: weighing 30 meshes of round calcium oxide particles and 30 meshes of silicon dioxide polymer particles, pouring the weighed raw materials into a 5 x 5mm mesh fabric mold, putting the mold into a sealing device, spraying modified two-component epoxy resin, drying, and taking down the 5 x 5mm mesh fabric in the mesh fabric mold;
s4, molding: and (3) fully stirring the coated particles obtained in the step (S2) and 5 × 5mm mesh cloth by adding a curing agent, pouring the mixture into a mold after stirring is finished, pouring the mixture into the mold, standing and forming, and taking out the mixture.
Embodiment 2, a method for manufacturing a particulate acoustic panel, comprising the steps of:
s1, mixing raw materials: weighing 80-mesh round calcium oxide, 80-mesh silicon dioxide polymer particles, aeolian sand and sand grains, and mixing and stirring the raw materials;
s2, film coating treatment: placing the mixed raw material obtained in the step S1 into a sealing device, stirring the mixed raw material inside the sealing device, and uniformly spraying modified two-component epoxy resin, so that the top of the suction plate is coated with a layer of modified two-component epoxy resin, fixing the particle raw material through the modified two-component epoxy resin, and drying to obtain coated particles;
s3, manufacturing mesh cloth: weighing 80-mesh round calcium oxide particles and 80-mesh silicon dioxide polymer particles, pouring the weighed raw materials into a 10 x 10mm grid cloth mold, putting the grid cloth mold into sealing equipment, spraying modified two-component epoxy resin, and taking off 10 x 10mm grid cloth in the grid cloth mold after drying;
s4, molding: and (3) fully stirring the coated particles obtained in the step (S2) and 10 x 10mm of grid cloth by adding a curing agent, pouring the mixture into a mold after stirring is finished, pouring the mixture into the mold, standing and forming, and taking out the mixture.
In the description of the present invention, it is to be understood that the terms "coaxial", "bottom", "one end", "top", "middle", "other end", "upper", "one side", "top", "inner", "front", "center", "both ends", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.
Furthermore, the terms "first", "second", "third", "fourth" are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated, whereby the features defined as "first", "second", "third", "fourth" may explicitly or implicitly include at least one such feature.
In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "disposed," "connected," "secured," "screwed" and the like are to be construed broadly, e.g., as meaning fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; the terms may be directly connected or indirectly connected through an intermediate, and may be communication between two elements or interaction relationship between two elements, unless otherwise specifically limited, and the specific meaning of the terms in the present invention will be understood by those skilled in the art according to specific situations.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (8)
1. A particle sound absorption plate comprises a binder, sound absorption particles, grid cloth and a sound absorption plate body, and is characterized in that the surface of the sound absorption particles is covered with a layer of the binder, the sound absorption particles comprise filler particles, framework particles, aeolian sand and sand grains, the framework particles and the filler particles are both composed of round calcium oxide and silicon dioxide polymer particles, and the grid cloth is arranged inside the sound absorption plate body.
2. A particulate acoustic panel in accordance with claim 1, wherein: the size of the round-grain calcium oxide is 30-80 meshes.
3. A particulate acoustic panel in accordance with claim 1, wherein: the silica polymer has a size of 30-80 mesh.
4. A particulate acoustic panel in accordance with claim 1, wherein: the mesh cloth is composed of round calcium oxide particles and silicon dioxide polymer particles.
5. A particulate acoustic panel in accordance with claim 1, wherein: the size of the grid cloth is 5mm to 10 mm.
6. A particulate acoustic panel in accordance with claim 1, wherein: the adhesive is modified two-component epoxy resin.
7. A particulate acoustic panel in accordance with claim 1, wherein: the sand grains are natural irregular multi-faced diamond-shaped filling grains.
8. A method for preparing a particle sound absorption board is characterized by comprising the following steps: the method comprises the following steps:
s1, mixing raw materials: weighing round calcium oxide, silicon dioxide polymer particles, aeolian sand and sand grains, and mixing and stirring the raw materials;
s2, film coating treatment: placing the mixed raw material obtained in the step S1 into a sealing device, stirring the mixed raw material inside the sealing device, and uniformly spraying modified two-component epoxy resin, so that the top of the suction plate is coated with a layer of modified two-component epoxy resin, fixing the particle raw material through the modified two-component epoxy resin, and drying to obtain coated particles;
s3, manufacturing mesh cloth: weighing round calcium oxide and silicon dioxide polymer particles, pouring the weighed raw materials into a 5 x 5mm grid cloth mold, putting the grid cloth mold into sealing equipment, spraying modified two-component epoxy resin, drying, and taking down the grid cloth in the grid cloth mold;
s4, molding: and (4) adding a curing agent into the coated particles obtained in the step (S2) and the mesh cloth, fully stirring, pouring the mixture into a mold after stirring, pouring the mixture into the mold, standing and forming, and taking out the mixture.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111452360.1A CN114149198A (en) | 2021-12-01 | 2021-12-01 | Particle sound absorption board and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111452360.1A CN114149198A (en) | 2021-12-01 | 2021-12-01 | Particle sound absorption board and preparation method thereof |
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| Publication Number | Publication Date |
|---|---|
| CN114149198A true CN114149198A (en) | 2022-03-08 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
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| CN202111452360.1A Pending CN114149198A (en) | 2021-12-01 | 2021-12-01 | Particle sound absorption board and preparation method thereof |
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| Country | Link |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102888902A (en) * | 2012-10-19 | 2013-01-23 | 燕翔 | Sandstone environmentally friendly acoustic board |
| CN104692824A (en) * | 2014-12-17 | 2015-06-10 | 国家电网公司 | Sandstone acoustic board used in transformer substation |
| US20180354865A1 (en) * | 2015-12-03 | 2018-12-13 | Goertek Inc. | Sound-Absorbing Material Particle and Preparation Method Thereof |
-
2021
- 2021-12-01 CN CN202111452360.1A patent/CN114149198A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102888902A (en) * | 2012-10-19 | 2013-01-23 | 燕翔 | Sandstone environmentally friendly acoustic board |
| CN104692824A (en) * | 2014-12-17 | 2015-06-10 | 国家电网公司 | Sandstone acoustic board used in transformer substation |
| US20180354865A1 (en) * | 2015-12-03 | 2018-12-13 | Goertek Inc. | Sound-Absorbing Material Particle and Preparation Method Thereof |
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Application publication date: 20220308 |