CN107314524A - Sound-proof material and preparation method thereof, sound-insulating member and air-conditioning - Google Patents
Sound-proof material and preparation method thereof, sound-insulating member and air-conditioning Download PDFInfo
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- CN107314524A CN107314524A CN201710617224.0A CN201710617224A CN107314524A CN 107314524 A CN107314524 A CN 107314524A CN 201710617224 A CN201710617224 A CN 201710617224A CN 107314524 A CN107314524 A CN 107314524A
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- 239000000463 material Substances 0.000 title claims abstract description 102
- 238000004378 air conditioning Methods 0.000 title claims abstract description 15
- 238000002360 preparation method Methods 0.000 title abstract description 6
- 239000000835 fiber Substances 0.000 claims description 15
- 238000000034 method Methods 0.000 claims description 10
- 239000010410 layer Substances 0.000 claims description 8
- 239000002131 composite material Substances 0.000 claims description 6
- 239000010935 stainless steel Substances 0.000 claims description 6
- 229910000881 Cu alloy Inorganic materials 0.000 claims description 5
- 239000007769 metal material Substances 0.000 claims description 5
- 239000011241 protective layer Substances 0.000 claims description 5
- 239000004411 aluminium Substances 0.000 claims description 4
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 4
- 239000003365 glass fiber Substances 0.000 claims description 4
- 229910001220 stainless steel Inorganic materials 0.000 claims description 4
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 3
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 claims description 3
- 239000010949 copper Substances 0.000 claims description 3
- 229910001092 metal group alloy Inorganic materials 0.000 claims description 3
- 229910000838 Al alloy Inorganic materials 0.000 claims description 2
- 229910001256 stainless steel alloy Inorganic materials 0.000 claims description 2
- 239000002184 metal Substances 0.000 claims 1
- 229910052751 metal Inorganic materials 0.000 claims 1
- 239000012530 fluid Substances 0.000 abstract description 9
- 230000032683 aging Effects 0.000 abstract description 7
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- 238000010168 coupling process Methods 0.000 abstract description 6
- 238000005859 coupling reaction Methods 0.000 abstract description 6
- 238000010521 absorption reaction Methods 0.000 description 7
- 229920000742 Cotton Polymers 0.000 description 5
- 239000011148 porous material Substances 0.000 description 5
- 238000004804 winding Methods 0.000 description 5
- 210000004081 cilia Anatomy 0.000 description 4
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- 238000009413 insulation Methods 0.000 description 3
- 206010054949 Metaplasia Diseases 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
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- 229910000831 Steel Inorganic materials 0.000 description 1
- 239000006096 absorbing agent Substances 0.000 description 1
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- 230000001886 ciliary effect Effects 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
- F24F13/24—Means for preventing or suppressing noise
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
- F24F13/24—Means for preventing or suppressing noise
- F24F2013/247—Active noise-suppression
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Soundproofing, Sound Blocking, And Sound Damping (AREA)
Abstract
The invention provides Sound-proof material and preparation method thereof, sound-insulating member and air-conditioning.The Sound-proof material includes：Netted rigid backbone；It is wound in the filament of netted rigid backbone outer surface；And it is arranged at the catch net of filametntary outer surface.The Sound-proof material is in network structure; coupling is produced between air fluid inside its space and the netted rigid backbone and filament that constitute hole; so that the Sound-proof material of the present invention has the advantages that acoustically effective is good, initial frequency is low, aging is slow and corrosion-resistant relative to traditional Sound-proof material; the presence of catch net can prevent filament from being come off with netted rigid backbone, and then extend the service life of Sound-proof material.
Description
Technical field
The present invention relates to technical field of sound isolation, in particular it relates to Sound-proof material and preparation method thereof, sound-insulating member and air-conditioning.
Background technology
With the continuous improvement of modern industrialization degree, people are also growing day by day for the concern of noise problem.Air-conditioning row
Industry or even the noise problem of various household appliances have been increasingly becoming a great index in properties of product.In the market, noise correlation
Complain also more and more, it is seen then that requirement also more and more higher of the people for noise.Being adopted Sound-proof material in traditional outdoor machine of air-conditioner more
With fire prevention non-woven fibre or PVC+ fire prevention non-woven fibre forms, outer machine noise is reduced by way of sound absorption.But exist
Beginning frequency is low, and the shortcoming of acoustically effective difference, the effect for reduction outdoor unit noise is little.
Research accordingly, with respect to Sound-proof material needs to be goed deep into.
The content of the invention
It is contemplated that at least solving one of technical problem in correlation technique to a certain extent.Therefore, the present invention
One purpose is to propose a kind of Sound-proof material that can be reduced initial frequency or improve average sound absorption coefficient.
In one aspect of the invention, the invention provides a kind of Sound-proof material.Embodiments in accordance with the present invention, the Sound-proof material
Including：Netted rigid backbone；It is wound in the filament of netted rigid backbone outer surface；And it is arranged at the guarantor of filametntary outer surface
Protecting wire net.Inventor has found that the Sound-proof material is in netted rigid bone of the air fluid with constituting hole inside network structure, its space
Coupling is produced between frame and filament, so that the Sound-proof material of the present invention relative to traditional Sound-proof material there is sound absorption to imitate
The advantages of really good, initial frequency is low, aging is slow and corrosion-resistant, the presence of catch net can prevent filament and netted rigid backbone
Come off, and then extend the service life of Sound-proof material.
Embodiments in accordance with the present invention, forming the material of netted rigid backbone includes metal material and rigid non-metallic material
At least one of, preferably at least one of stainless steel, copper alloy and silicate.
Embodiments in accordance with the present invention, the mesh-density of netted rigid backbone is 10-50 mesh.
Embodiments in accordance with the present invention, filament is selected from least one of glass fiber, blanket fiber and eider down.
Embodiments in accordance with the present invention, it is filametntary a diameter of 1-100 microns.
Embodiments in accordance with the present invention, filametntary volume accounts for the 30%-70% of Sound-proof material overall volume.
Embodiments in accordance with the present invention, formed catch net material be hardmetal material, preferably aluminium, stainless steel, copper and
At least one of metal alloy.
Embodiments in accordance with the present invention, the acoustic absorptivity of Sound-proof material is 0.2-0.9.
Embodiments in accordance with the present invention, the initial frequency of Sound-proof material is 100Hz-1500Hz.
Embodiments in accordance with the present invention, the porosity of Sound-proof material is 0.4-0.7.
In another aspect of this invention, the invention provides a kind of method for preparing Sound-proof material noted earlier.This method bag
Include：Filament is wrapped in netted rigid backbone outer surface, rigid backbone composite fibre silk layer is obtained；Mix fine in rigid backbone
Tie up silk layer outer surface and form protective layer, obtain the Sound-proof material.Thus, the preparation method is easy to be ripe, and cost is low, it is easy to industry
Metaplasia is produced.
In still another aspect of the invention, the invention provides a kind of sound-insulating member.Embodiments in accordance with the present invention, the sound insulation
Part includes foregoing Sound-proof material.Thus, the sound-insulating member has that acoustically effective is good, initial frequency is low, aging is slow and resistance to
The advantages of corrosion, service life is long.
In still another aspect of the invention, the invention provides a kind of air-conditioning.Embodiments in accordance with the present invention, the air-conditioning includes
Foregoing sound-insulating member.Thus, air-conditioning of the invention can meet the requirement of user's low noise.
Brief description of the drawings
Fig. 1 is the top plan view of Sound-proof material in one embodiment of the invention.
Fig. 2 is the schematic cross-section of Sound-proof material in another embodiment of the present invention.
Fig. 3 is the partial enlargement signal of Sound-proof material rigid backbone composite fibre silk layer 20 in another embodiment of the invention
Figure.
Fig. 4 is the acoustic absorptivity comparison diagram of Sound-proof material in the embodiment of the present invention 1 and comparative example 1.
Embodiment
Embodiments of the invention are described below in detail.The embodiments described below is exemplary, is only used for explaining this hair
It is bright, and be not considered as limiting the invention.Unreceipted particular technique or condition in embodiment, according to text in the art
Offer described technology or condition or carried out according to product description.Agents useful for same or the unreceipted production firm person of instrument,
For can be by the conventional products of acquisition purchased in market.
In one aspect of the invention, the invention provides a kind of Sound-proof material.Embodiments in accordance with the present invention, referring to Fig. 2
And Fig. 3, Fig. 3 are the partial enlarged drawings of rigid backbone composite fibre silk layer 20 in Fig. 2, the Sound-proof material includes：Netted rigid backbone
21；It is wound in the filament 22 of the netted outer surface of rigid backbone 21；And it is arranged at the catch net 10 of the outer surface of filament 22.Hair
A person of good sense has found that the Sound-proof material is in network structure, referring to Fig. 1, the air fluid inside its space and the netted rigidity for constituting hole
Coupling is produced between skeleton and filament, so that the Sound-proof material of the present invention has sound absorption relative to traditional Sound-proof material
Effect is good, initial frequency is low, aging is slow and it is corrosion-resistant the advantages of, the presence of catch net can prevent filament and netted rigid bone
Frame comes off, and then extends the service life of Sound-proof material.
It should be noted that initial frequency refers to first Frequency point that acoustic absorptivity is more than 0.2.
Embodiments in accordance with the present invention, in order that Sound-proof material has excellent soundproof effect and with certain hardness and by force
Degree, in an embodiment of the present invention, forms the material of netted rigid backbone in metal material and rigid non-metallic material
At least one of at least one, preferably stainless steel, copper alloy and silicate.Thus, being not only Sound-proof material has good suction
Sound effective value, can also play certain supporting role, be allowed to be hardly damaged, and aging is slow, increases the service life.
Embodiments in accordance with the present invention, the mesh-density of netted rigid backbone does not have special limitation and requirement, this area
Technical staff can flexibly select according to actual conditions.In some embodiments of the invention, the grid of netted rigid backbone is close
Spend for 10-50 mesh.Thus, Sound-proof material has optimal acoustically effective and relatively low initial frequency.
Embodiments in accordance with the present invention, the mesh shape of netted rigid backbone does not limit requirement, can be regular pattern,
Such as grid, rhombus, circle and polygon etc. or irregular pattern, those skilled in the art can be according to actual need
Ask flexible selection.
Embodiments in accordance with the present invention, external sound wave passes to human body external auditory meatus by medium, then passes to eardrum.Eardrum shakes
It is dynamic, inner ear is passed to after amplifying by phonophore, i-coch cilium is stimulated and produces nerve impulse.Nerve impulse is along listening god
Through passing to corticocerebral auditory center, the sense of hearing is formed.And the diameter of cilium is about 0.1 μm, according to the structure of human ear, class is selected
The non-woven fibre of Sound-proof material in the prior art is substituted like the fiber silk structure of human ear ciliary structures, the starting of Sound-proof material can be reduced
Frequency.In an embodiment of the present invention, filament is selected from least one of glass fiber, blanket fiber and eider down.Thus,
The cilium of the similar human ear of structure, making the Sound-proof material of the present invention has relatively low initial frequency, higher acoustic absorptivity.
Embodiments in accordance with the present invention, in order that filametntary structure is more close to the cilium of human ear, the present invention's
It is filametntary a diameter of 1-100 microns in embodiment.Thus, above-mentioned filament can substitute the nothing of Sound-proof material in the prior art
Fiber is spun, the initial frequency of Sound-proof material can be reduced.
Embodiments in accordance with the present invention, the canoe that filament is wound in netted rigid backbone does not limit requirement, this
Art personnel can flexibly select according to actual conditions.But in order that Sound-proof material has more preferably acoustically effective, at this
In some embodiments of invention, filament uniform winding is in the outer surface of netted rigid backbone.
Embodiments in accordance with the present invention, filament is wound in the winding density of netted rigid backbone also without special limitation
It is required that, those skilled in the art can flexibly select according to actual conditions.In some embodiments of the invention, filament is wound
Volume account for the 30%-70% of overall volume.Thus, Sound-proof material has an optimal acoustically effective, and winding density is too low, influence every
The acoustically effective of sound cotton；Winding density is too big, is unfavorable for the air fluid inside Sound-proof material space with constituting the netted firm of hole
Property skeleton and filament between produce coupling, so still influence the acoustically effective of Sound-proof material, be unfavorable for initial frequency
Reduction.
Embodiments in accordance with the present invention, in order to preferably protect netted rigid backbone and filament not to fall off, form protection
The material of net is hardmetal material, preferably at least one of aluminium, stainless steel, copper and metal alloy.Thus, Sound-proof material is difficult
Damage, aging is slow, corrosion-resistant, and service life is long.
Embodiments in accordance with the present invention, the mesh shape of catch net does not limit requirement, can be regular pattern, can also
It is irregular pattern, spacing rate of grid also can be adjusted arbitrarily, those skilled in the art can flexibly select according to the actual requirements.
Embodiments in accordance with the present invention, the acoustic absorptivity of Sound-proof material is 0.2-0.9, for example can for 0.2,0.3,0.4,
0.5th, 0.6,0.7,0.8 or 0.9.Thus, Sound-proof material of the invention has good acoustically effective, can meet user's low noise
Requirement.
Embodiments in accordance with the present invention, the initial frequency of Sound-proof material is 100Hz-1500Hz, for example can for 100,200,
300th, 400,500,600,700,800,900,1000,1100,1200,1300,1400 or 1500Hz.Thus, it is of the invention every
Sound cotton has relatively low initial frequency and higher acoustic absorptivity, can meet the requirement of user's low noise.
Embodiments in accordance with the present invention, the porosity of Sound-proof material is 0.4-0.7.Thus, Sound-proof material has optimal performance.
It should be noted that the surface acoustic impedance and acoustic absorptivity of the Sound-proof material of the present invention are according to elasticity in two-phase media
The propagation principle of ripple, is to say in the case of even pore distribution by the theory, it is considered to pore interior fluid and constitute hole
Solid skeletal between the coupling that produces, and the dynamic response of analytical structure.The theoretical proof：If even pore distribution
The structural framework of porous material, its impedance is much larger than the material that air dielectric is constituted.
It is theoretical according to Biot, following stress relation is met when sound wave is propagated in the porous material：
Netted rigid backbone：
Air fluid：
Wherein, N --- filametntary modulus of shearing,
θf--- air fluid volumetric expansion,
θs--- netted rigid backbone volumetric expansion,
Q --- potential energy coupling factor,
P, Q, R are coefficient of elasticity, can be determined with below equation：
In formula：Kb--- netted rigid backbone equivalent volume modulus of elasticity,
Ks--- the modulus of elasticity of netted rigid backbone,
Kf--- air fluid limited bulk modulus of elasticity.
The table of Sound-proof material can be derived by by combining wave equation (1) and (2) and boundary condition by above formula (3)-(5)
Face impedance and its acoustic absorptivity.
According to above-mentioned principle, people in the art can change the specific material of netted rigid backbone according to the actual requirements,
The Sound-proof material of the mixed structure with hard skeleton is made, it is more preferable relative to homogenous material acoustically effective.Change sound insulation simultaneously
The parameters such as cotton internal fiber silk diameter, porosity, the acoustic absorptivity and initial frequency of the Sound-proof material can also change therewith.
In another aspect of this invention, the invention provides a kind of method for preparing Sound-proof material noted earlier.This method bag
Include：Filament is wrapped in netted rigid backbone outer surface, rigid backbone composite fibre silk layer is obtained；Mix fine in rigid backbone
Tie up silk layer outer surface and form protective layer, obtain the Sound-proof material.Thus, the preparation method is easy to be ripe, and cost is low, it is easy to industry
Metaplasia is produced.
Embodiments in accordance with the present invention, the canoe that filament is wound in netted rigid backbone does not limit requirement, this
Art personnel can flexibly select according to actual conditions.But in order that Sound-proof material has more preferably acoustically effective, at this
In some embodiments of invention, filament uniform winding is in the outer surface of netted rigid backbone.
Embodiments in accordance with the present invention, the method for forming protective layer does not limit requirement, and those skilled in the art can root
Flexibly selected according to actual conditions.In some embodiments of the invention, form the method for protective layer and can select to wind, coat,
The methods such as the fixed connection structures such as bonding, buckle.Thus, it is simple and efficient.
In still another aspect of the invention, the invention provides a kind of sound-insulating member.Embodiments in accordance with the present invention, the sound insulation
Part includes foregoing Sound-proof material.Thus, the sound-insulating member has that acoustically effective is good, initial frequency is low, aging is slow and resistance to
The advantages of corrosion, service life is long.
In still another aspect of the invention, the invention provides a kind of air-conditioning.Embodiments in accordance with the present invention, the air-conditioning includes
Foregoing sound-insulating member.Thus, air-conditioning of the invention can meet the requirement of user's low noise.
It will be understood by those skilled in the art that except the sound-insulating member of the present invention, the air-conditioning must also including conventional air-conditioning
The other structures and part that need to have, such as, and condenser, evaporator, temperature sensor, axial flow blower, stepper motor, control
It is plate, drip tray and water pipe, wind deflector, air cleaner, cross flow fan, compressor, four-way valve, fluid reservoir, start-up capacitance, shockproof
Pad, heat-preservation cotton, shell etc. are constituted.
Embodiments in accordance with the present invention, Sound-proof material of the invention also can be applied not only to air-conditioning, can also be applied to it
In his any required structure for carrying out sound absorption processing, such as, and the knot such as washing machine, wallboard, ceiling, suspended absorber, compressor
Structure.
Embodiment
Embodiment 1
This embodiment offers a kind of Sound-proof material, it includes netted rigid backbone, is wound in netted rigid backbone outer surface
Filament, and be arranged at the catch net of filametntary outer surface, wherein, netted rigid backbone selects stainless (steel) wire, filament
From glass fiber, catch net selects aluminium material.
Comparative example 1
Sound-proof material is used as from pure cotton fiber.
Under the same conditions in testing example 1 in Sound-proof material and comparative example 1 Sound-proof material acoustic absorptivity, its result is shown in
Fig. 4.Curve 1 is the absorption coefficient curve of Sound-proof material in comparative example 1 in Fig. 4, and curve 2 is that the sound absorption of Sound-proof material in embodiment 1 is bent
Line, it can clearly be seen that the acoustic absorptivity of the low-frequency range of curve 2 is apparently higher than curve 1.
In the description of this specification, reference term " one embodiment ", " some embodiments ", " example ", " specifically show
The description of example " or " some examples " etc. means to combine specific features, structure, material or the spy that the embodiment or example are described
Point is contained at least one embodiment of the present invention or example.In this manual, to the schematic representation of above-mentioned term not
Identical embodiment or example must be directed to.Moreover, specific features, structure, material or the feature of description can be with office
Combined in an appropriate manner in one or more embodiments or example.In addition, in the case of not conflicting, the skill of this area
Art personnel can be tied the not be the same as Example or the feature of example and non-be the same as Example or example described in this specification
Close and combine.
Although embodiments of the invention have been shown and described above, it is to be understood that above-described embodiment is example
Property, it is impossible to limitation of the present invention is interpreted as, one of ordinary skill in the art within the scope of the invention can be to above-mentioned
Embodiment is changed, changed, replacing and modification.
Claims (13)
1. a kind of Sound-proof material, it is characterised in that including：
Netted rigid backbone；
Filament, the filament is wound in the netted rigid backbone outer surface；And
Catch net, the catch net is arranged at the filametntary outer surface.
2. Sound-proof material according to claim 1, it is characterised in that forming the material of the netted rigid backbone includes metal
At least one of at least one of material and rigid non-metallic material, preferably stainless steel, copper alloy and silicate.
3. Sound-proof material according to claim 1, it is characterised in that the mesh-density of the netted rigid backbone is 10-50
Mesh.
4. Sound-proof material according to claim 1, it is characterised in that the filament is selected from glass fiber, blanket fiber
At least one of and eider down.
5. Sound-proof material according to claim 1, it is characterised in that described filametntary a diameter of 1-100 microns.
6. Sound-proof material according to claim 1, it is characterised in that the filametntary volume accounts for the overall body of the Sound-proof material
Long-pending 30%-70%.
7. Sound-proof material according to claim 1, it is characterised in that the material for forming the catch net is hardmetal material
Material, preferably at least one of aluminium, stainless steel, copper and metal alloy.
8. Sound-proof material according to claim 1, it is characterised in that the acoustic absorptivity of the Sound-proof material is 0.2-0.9.
9. Sound-proof material according to claim 1, it is characterised in that the initial frequency of the Sound-proof material is 100Hz-
1500Hz。
10. Sound-proof material according to claim 1, it is characterised in that the porosity of the Sound-proof material is 0.4-0.7.
11. a kind of Sound-proof material method prepared any one of claim 1-10, it is characterised in that including：
Filament is wrapped in netted rigid backbone outer surface, rigid backbone composite fibre silk layer is obtained；
Protective layer is formed in rigid backbone composite fibre silk layer outer surface, the Sound-proof material is obtained.
12. a kind of sound-insulating member, it is characterised in that including the Sound-proof material any one of claim 1-10.
13. a kind of air-conditioning, it is characterised in that including the sound-insulating member described in claim 11.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108269564A (en) * | 2018-03-11 | 2018-07-10 | 西北工业大学 | A kind of sound-insulation ears-shield being made of open cell type cellular glass and air bag |
| CN110608528A (en) * | 2018-06-15 | 2019-12-24 | 南京中远高分子材料科技有限公司 | Heat-resistant air conditioner soundproof cotton |
| CN111651874A (en) * | 2020-05-25 | 2020-09-11 | 国网江西省电力有限公司电力科学研究院 | Method for calculating sound absorption performance of fiber material |
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| JPH073935A (en) * | 1991-10-11 | 1995-01-06 | Toho Kenzai:Kk | Fire resisting/sound insulating construction ceiling board |
| WO2001031131A1 (en) * | 1999-10-29 | 2001-05-03 | Owens Corning | Fibrous acoustical insulation product |
| US20060123724A1 (en) * | 2004-12-09 | 2006-06-15 | Pollack Robert W | Device and method to provide air circulation space proximate to insulation material |
| CN101225690A (en) * | 2008-01-12 | 2008-07-23 | 山东深科保温板墙开发有限公司 | Insulation roof slab and method for making same |
| CN102384571A (en) * | 2011-09-29 | 2012-03-21 | Tcl空调器（武汉）有限公司 | Silencing structure of air-conditioning compressor |
| CN202677823U (en) * | 2012-06-05 | 2013-01-16 | 大连渡边过滤有限公司 | Sound damping sheet |
| CN105856704A (en) * | 2016-04-06 | 2016-08-17 | 广西德福特科技有限公司 | Sound-absorbing insulation cotton and preparation method thereof and preparation method of sound-absorbing insulation mat |
| CN207146869U (en) * | 2017-07-26 | 2018-03-27 | 广东美的制冷设备有限公司 | Sound-proof material, sound-insulating member and air-conditioning |
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| CN108269564A (en) * | 2018-03-11 | 2018-07-10 | 西北工业大学 | A kind of sound-insulation ears-shield being made of open cell type cellular glass and air bag |
| CN110608528A (en) * | 2018-06-15 | 2019-12-24 | 南京中远高分子材料科技有限公司 | Heat-resistant air conditioner soundproof cotton |
| CN111651874A (en) * | 2020-05-25 | 2020-09-11 | 国网江西省电力有限公司电力科学研究院 | Method for calculating sound absorption performance of fiber material |
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