CN106242634A - A kind of composite sound-absorbing material and preparation method thereof - Google Patents
A kind of composite sound-absorbing material and preparation method thereof Download PDFInfo
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- CN106242634A CN106242634A CN201610662404.6A CN201610662404A CN106242634A CN 106242634 A CN106242634 A CN 106242634A CN 201610662404 A CN201610662404 A CN 201610662404A CN 106242634 A CN106242634 A CN 106242634A
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- absorbing material
- composite sound
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- grass
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- 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
- C04B38/00—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof
- C04B38/08—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof by adding porous substances
- C04B38/085—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof by adding porous substances of micro- or nanosize
-
- 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
- C04B26/04—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
-
- 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
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/20—Mortars, concrete or artificial stone characterised by specific physical values for the density
Abstract
A kind of composite sound-absorbing material and preparation method thereof, grass stalk is put into immersion 30min in the lime water of 2% and carries out demoulding process, remove the wax coat on weeding stalk surface, cohesive force between diatom ooze is strengthened, the grass stalk removing surface waxiness is put into grass chopper is cut into 40mm 100mm length, the present invention has " molecular sieve " structure of uniqueness, its porosity is up to 90%, not only there is environmental protection, purify air, breathe damping, fire-retardant, low cost and plurality of advantages easy to process, and there is the strongest reduction noise result, can effectively absorb harmful high frequency segment, decay low frequency noise, shorten the reverberation time, there is the most wide application prospect.
Description
Technical field
The present invention relates to a kind of sound-absorbing material, particularly relate to a kind of composite sound-absorbing material and preparation method thereof.
Background technology
Along with the propelling of economic globalization, the fast development of process of industrialization, urban development is rapid, at fast-developing warp
Under Ji, substantial amounts of non-renewable resources are consumed, and " three wastes " discharge capacity exceeds standard, greenhouse effect aggravation and global warming, I
Environment just suffer from increasingly severe destruction.Sound pollution, atmospheric pollution, water pollution and noxious waste pollution are public
Think that the world four pollutes greatly.And noise is a kind of sensation public hazards, as the one of sound, there is acoustic features, be different from other
The harm that harmful and noxious substance causes, it does not has pollutant, does not bring substantivity to surrounding when propagating in atmosphere
The material of toxic, simultaneously it the impact of environment is not accumulated, lasting, the distance of propagation is limited, and once sound source stops sounding,
Noise i.e. disappears.But the harm that noise produces is huge, noise hearing damage induces an illness, and disturbs Working Life, damages instrument
Device equipment, its extent of injury is closely related with the time of the frequency of noise, intensity and exposure.Therefore, sqouynd absorption lowering noise is current city
The research direction that bustling noise of a market environment is popular, can focus on unlike other pollutant in view of noise, therefore need to pass through particular form
It is carried out sound absorption process and is controlled.
The control of noise generally has to be isolated noise source, the propagation path of noise and recipient three or protects, will
The energy of noise blocks or absorbs.Sound-absorbing material is made by the porous of self, membrane action or resonant interaction and to incidence
Acoustic energy has the material of Absorption.Most of materials all have certain acoustical absorptivity, typically average sound absorption coefficient are more than
The material of 0.2 is referred to as sound-absorbing material, and the average sound absorption coefficient material more than 0.56 is referred to as efficient sound-absorbing material.
The sound-absorbing material of early application is mainly plant fiber products, such as cotton fibriia, felt, cane fibre board, wooden
Fibre board etc..These materials have good sound absorbing capabilities in the range of medium, high frequency, but the performances such as fire prevention, anticorrosion, protection against the tide are relatively
Difference.Hereafter, along with the discovery of inorganic fibers, such as glass cotton, rock wool etc..Its light weight, do not fire, be stale-proof, be difficult to aging, price
Cheap, thus the sound-absorbing material that gradually instead of Plant fiber is used widely.But crisp because of fiber in construction, frangibility shape
Becoming dust impact to breathe, stimulate skin, pollute environment, after meeting water or moisture absorption, sound absorbing capabilities is substantially reduced, limit its moist,
The place that high temperature, air-flow are big uses.Foam type sound-absorbing material is excellent for medium-high frequency (more than 500Hz) sound absorbing capabilities, and low frequency is inhaled
Acoustic performance is undesirable, and foam plastics is the most aging.Acoustic construction material is made up of porous construction material, as pottery absorbs sound
Plate, pearl stone sound absorbing baffle etc..But sound absorbing capabilities is poor, and the heaviest, use the most extensive.Sound absorption metal material lightweight, intensity
High, high temperature resistant, such as aluminum matter fibre board, but cost is the highest.
Summary of the invention
It is an object of the invention to provide a kind of composite sound-absorbing material and preparation method thereof, the present invention utilizes diatom ooze and grass
The composite sound-absorbing material that stalk is made, due to unique " molecular sieve " structure, not only has environmental protection, purifies air, breathing damping, resistance
Combustion, low cost, the plurality of advantages such as easy to process, and there is the strongest reduction noise function, can effectively absorb human body
Harmful high frequency segment, and low frequency noise of decaying, shorten the reverberation time, have the most wide application prospect.
The present invention is through the following steps that realize:
Step one, grass stalk is put into and the lime water of 2% soaks 30min carries out demoulding process, go the waxiness on weeding stalk surface
Layer so that and the cohesive force reinforcement between diatom ooze；
Step 2, the grass stalk removing surface waxiness is put into grass chopper is cut into 40mm 100mm length；
Step 3, by diatom ooze, grass stalk and water mix by the mass ratio of 1:0.2:0.3, diatom ooze is in hydration afterwards
Lower and grass stalk combines, and is subsequently adding 1% polyvinyl alcohol adhesive, 1% triethanolamine reinforcing agent, is sufficiently stirred in mixing and blending machine
The compound of leather hard is become after uniformly；
Step 4, the compound of leather hard is paved in mold box, be sent in press pressurization by transmission equipment, according to
Purposes and type apply different pressure, and unit pressure is 1.5-2.0 MPa, the compound of densification leather hard afterwards with locking
Tight device fastens, and maintains the consolidation completing diatom ooze in a compressed state with grass stalk；
Step 5, in order to shorten firm time, the compound temperature to be placed in of locking is in the strengthening curing kilns of 70-90 degree Celsius
Hardening, the time is 18-24h then mould unloading, then natural curing is dried for 7 days under keeping warm mode, and baking temperature is 50-70
DEG C, the moisture content making compound is 5% ± 2%, to reduce the use contractility of compound, improves the stability of its size, then
Carry out cutting edge shaping and sanding processes to guarantee that compound meets size and the thickness requirement of user.
Described grass stalk obstructs for Caulis et Folium Oryzae.
Described Caulis et Folium Oryzae stalk is put into and is cut into 80mm length in grass chopper.
A kind of composite sound-absorbing material, makes according to above-mentioned preparation method.
The content of described composite sound-absorbing material Caulis et Folium Oryzae stalk is 5-10%.
The density of described composite sound-absorbing material is 350-500 kg/m3.
The thickness of described composite sound-absorbing material is 2-10cm.
The cavity width at described composite sound-absorbing material back is 0-3cm.
The content of described composite sound-absorbing material Caulis et Folium Oryzae stalk is 7.5%.
The density of described composite sound-absorbing material is 500 kg/m3.
The thickness of described composite sound-absorbing material is 8cm.
The cavity width at described composite sound-absorbing material back is 3cm.
The solution have the advantages that: the present invention has " molecular sieve " structure of uniqueness, and its porosity is up to 90%, not only
There is environmental protection, purify air, breathing damping, fire-retardant, low cost and plurality of advantages easy to process, and there is the strongest reduction
Noise result, can effectively absorb harmful high frequency segment, low frequency noise of decaying, shortening reverberation time, have quite
Wide application prospect.
Accompanying drawing explanation
Fig. 1 is pictorial diagram prepared by the present invention.
Fig. 2 is the graph of relation of grass of the present invention stalk volume and sound absorbing capabilities.
Fig. 3 is the size graph of relation with sound absorbing capabilities of grass of the present invention stalk.
Fig. 4 is the graph of relation of density of material of the present invention and sound absorbing capabilities.
Fig. 5 is the graph of relation of material thickness of the present invention and sound absorbing capabilities.
Fig. 6 is the graph of relation of material back cavity of the present invention and sound absorbing capabilities.
Detailed description of the invention
Describe the present invention in detail below in conjunction with accompanying drawing 1-6 to be had the advantage that, it is intended to help reader more preferable
Ground understands the essence of the present invention, but the enforcement of the present invention and protection domain can not be constituted any restriction.
In obstructing due to grass, content of ashes is high, and commonly reaching the predominant amount in 15.5%, and ash is SiO2, fine plant
Dimension is formed apolar surfaces, the absorption of material and the formation of hydrogen bond is produced impact, thus reduces between grass stalk, diatom ooze
Cohesive force；And grass stalk in ether extraction thing content higher, content is up to nearly 7%, content be mainly in Plant fiber fat,
Vinegar and resin.The surface of grass stalk is more smooth, impact bonding each other.Therefore, before preparing, need grass stalk is carried out quick lime
Immersion carries out demoulding process, removes the wax coat on surface, in order to strengthen the cohesive force between diatom ooze.
Time prepared by the present invention, grass stalk is put into immersion 30min in the lime water of 2% and carries out demoulding process, remove weeding stalk table
The wax coat in face so that and the cohesive force reinforcement between diatom ooze；
The grass stalk removing surface waxiness is put into grass chopper is cut into 40mm × 100mm length；
Diatom ooze, grass stalk and water being mixed by the mass ratio of 1:0.2:0.3, diatom ooze obstructs with grass under hydration afterwards
In conjunction with, it is subsequently adding 1% polyvinyl alcohol adhesive, 1% triethanolamine reinforcing agent, becomes after stirring in mixing and blending machine
The compound of leather hard；
The compound of leather hard is paved in mold box, is sent in press pressurization by transmission equipment, according to purposes and
Type applies different pressure, and unit pressure is 1.5-2.0 MPa, and the compound of densification leather hard afterwards also uses locking device
Fasten, maintain the consolidation completing diatom ooze in a compressed state with grass stalk；
In order to shorten firm time, the compound temperature to be placed in of locking is hardened in the strengthening curing kilns of 70-90 degree Celsius, time
Between be 18-24h then mould unloading, then natural curing is dried for 7 days under keeping warm mode, and baking temperature is 50-70 DEG C, makes to mix
The moisture content closing material is 5% ± 2%, to reduce the use contractility of compound, improves the stability of its size, then carries out cutting edge
Shaping and sanding process to guarantee that compound meets size and the thickness requirement of user.
Described grass stalk obstructs for Caulis et Folium Oryzae.
Described Caulis et Folium Oryzae stalk is put into and is cut into 80mm length in grass chopper.
A kind of composite sound-absorbing material, makes according to above-mentioned preparation method.
The content of described composite sound-absorbing material Caulis et Folium Oryzae stalk is 5-10%.
The density of described composite sound-absorbing material is 350-500 kg/m3.
The thickness of described composite sound-absorbing material is 2-10cm.
The cavity width at described composite sound-absorbing material back is 0-3cm.
The content of described composite sound-absorbing material Caulis et Folium Oryzae stalk is 7.5%.
The density of described composite sound-absorbing material is 500 kg/m3.
The thickness of described composite sound-absorbing material is 8cm.
The cavity width at described composite sound-absorbing material back is 3cm.
The sound absorption principle of the present invention: first, diatom mineral are a kind of nano level porous material (micro-pore diameter about 0.1-
0.2 micron), porosity is up to 90%, rule, is fitly arranged in circle and pin row, the minute aperture quantity ratio in its unit are
Linesless charcoal taller go out thousands of times, its prominent molecular lattice structure feature, determine the function of its uniqueness, be interconnected between space
And connect each other with the external world, again, owing to diatom ooze is different, in binding agent and enhancing due to material each characteristic with Caulis et Folium Oryzae stalk
Under the effect of agent, in conjunction with also forming small hole, which further increases the porosity of compound porous sound-absorbing material, work as sound
When source vibrations produce sound wave incident to material surface layer, due to the reflection of material surface layer, it is reflected back a part of sound wave, and remains
Part then enters material internal, and sound wave drives the vibrations of adjacent particle in material internal vibrations, hands on each other, and hole
In air produce friction due to vibrations and material walls, close on the air of material walls and be difficult to flowing and produce viscosity, viscous hinders
Power forces airborne kinetic energy to be converted to friction and generates heat energy so that acoustic energy is gradually decayed, thus reaches the purpose of sound absorption, always
Saying on body, the composite sound-absorbing material of the present invention is that the characteristic by porous own is to realize noise elimination noise reduction.
Composite sound-absorbing material of the present invention measures its acoustic absorptivity by standing-wave-tube method.
With reference to Fig. 2 take Caulis et Folium Oryzae stalk content be respectively as follows: 5%, 7.5%, 10% time, the average sound absorption coefficient of composite sound-absorbing material divides
Not being 0.52,0.66,0.58, total average sound absorption coefficient is as Caulis et Folium Oryzae stalk content to be increased and change of fluctuating, within 500Hz
Low frequency curve in, sound absorbing capabilities along with in material Caulis et Folium Oryzae stalk content reduce and raise, this is mainly Caulis et Folium Oryzae stalk, and content is the lowest, hole
Gap rate is few, preferable to the acoustically effective of low frequency, and in the high frequency stage, acoustic absorptivity increases along with grass stalk content and increases, and passes through Fig. 2
Data show, when Caulis et Folium Oryzae stalk content is 7.5%, comprehensive sound absorbing capabilities is best.
The Caulis et Folium Oryzae selecting diameter 2.0X40mm, 2.0X60mm, 2.0X80mm, 2.0X100mm size with reference to Fig. 3 respectively obstructs,
Being shown by data in Fig. 3, at low frequency region, the low frequency absorption performance of material reduces along with the increase of Caulis et Folium Oryzae stalk length,
Medium-high frequency region, the medium-high frequency sound absorbing capabilities of material increases, this is because porous material is inhaled along with the increase of Caulis et Folium Oryzae stalk length
Sound be mainly between material formed together with space, short undersized Caulis et Folium Oryzae stalk and diatom ooze combine tightr, closely knit, and space is more
Thin material acoustically effective is the best, reduces the most on the contrary for high-frequency sound, after length is more than 80mm, long by increasing Caulis et Folium Oryzae stalk
The effect of the sound absorbing capabilities that degree improves material is the most inconspicuous, is shown by Fig. 3 data, when Caulis et Folium Oryzae obstructs a length of 80mm,
Comprehensive sound absorbing capabilities is best.
Understand with reference to Fig. 4 analysis, with acoustics correlation theory as foundation, when the thickness of absorbent treatment keeps constant, material
Acoustic absorptivity increases along with the increase of density of material, and maximum acoustic absorptivity moves to low frequency direction, density of material the biggest for
The effect of low-frequency sound sound absorption is the best.
Additionally, according to the feature of sound-absorbing porous material, its sound absorbing capabilities is not only produced by the hole structure of material, structure element
Raw impact, and the pressure differential of material both sides is closely related with the ratio of linear velocity i.e. flow resistance, the material that flow resistance is big, sound wave
Just strong in the reflection of its surface, the sound wave being entered material internal by hole is few, sound wave friction material and be lost little, flow resistance is little
Material, sound wave frictional dissipation is little, and sound absorbing capabilities is poor, and the flow resistance of material is directly proportional to density, and from Fig. 4, data show density of material
Increasing, its acoustic absorptivity moves to low frequency direction, and acoustically effective is effective at low frequency region, is shown by Fig. 4 data, when compound
When sound-absorbing material density is 500kg/m3, comprehensive sound absorbing capabilities is best.
With reference to Fig. 5 when assuming that porous material is infinite thickness, sound wave incident is to material surface, it may occur that to material internal
The phenomenon of diffraction, sound wave gradually extends propagation at material internal, and along with the increase of distance, energy harmony is pressed with certain decay.Warp
The data analysis crossing Fig. 5 finds, its attenuation is not directly proportional to the thickness of material, and this is mainly determined by the density of material, material
Material is loose bulk and density is less, can be by increasing material thickness to the sound-absorbing effect of low-frequency sound to improve material
Method realizes, but when flow resistance is increased to certain limit value, the sound absorption efficiency of material is then the most little with thickness variation relation,
So, in order to obtain optimal acoustically effective, the thickness of porous material is also required to control an optimal float value, and normal conditions are many
Porous materials is higher for medium-high frequency sound acoustic absorptivity, and rather low-frequency sound acoustic absorptivity is relatively low, along with the increasing of material thickness
Adding, sound absorption frequency curve presents the trend moved by high frequency to low frequency direction, and low frequency absorption coefficient increases the most therewith, this reaction
Relationship Between Dynamic Change between sound-absorbing material thickness and acoustic absorptivity.
Table 1 material thickness and the relation of sound absorbing capabilities
| Material thickness (cm) | 2 | 4 | 6 | 8 | 10 |
| Average sound absorption coefficient | 0.58 | 0.65 | 0.72 | 0.80 | 0.76 |
| Noise reduction coefficient | 0.56 | 0.68 | 0.70 | 0.78 | 0.82 |
Being shown by Fig. 5, the average sound absorption coefficient of 4cm thick material is extremely low in low-frequency range, as shown in Table 1, and the average suction of material
Sonic system number increases along with the thickness of material and increases, but after thickness reaches 8cm, sound absorbing capabilities is more stable, and change fluctuation is little,
This is with performed an analysis identical, also demonstrates that the sound absorbing capabilities of raising material can not rely solely on increase material thickness and realize,
Along with to the research of Urban Acoustic Environment deeply, the traffic noise structure when composition of noise is travelled by vehicle greatly in city
Become, and the frequency major part that it sends is medium and low frequency, so, improve Urban Acoustic Environment, reduce the noise impact on life, choosing
Select suitable material thickness, by being one of important factor of acoustic environment of having obtained, shown by Fig. 5 data, work as material thickness
During for 8cm, comprehensive sound absorbing capabilities is best.
Show with reference to Fig. 6, increase material cavity behind and can improve its sound absorbing capabilities, when the cavity width at material back
During for 3cm, material significantly improves for the acoustically effective of low-frequency sound, and sound absorption curve is moved to low frequency by medium-high frequency, but comprehensively
See that the average sound absorption coefficient change in whole frequency is little, display that, in the case of material thickness is constant, improve sound absorption properties
Can, the distance changing material back cavity is good selection, it may have the biggest practice significance, is shown by Fig. 6 data,
When material cavity width behind is 3cm, comprehensive sound absorbing capabilities is best.
Caulis et Folium Oryzae stalk is the factor that the sound absorbing capabilities to composite sound-absorbing material of the present invention plays material impact, by changing Caulis et Folium Oryzae
The length of stalk so that the high frequency sound absorbing capabilities of material is improved, and low frequency absorption performance then can decline.
The low frequency absorption performance of composite sound-absorbing material of the present invention is affected very big by material thickness, along with thickness increases, low
Frequently sound absorbing capabilities improves, and the curve that absorbs sound by high frequency to low frequency variations, but when material thickness increases to more than 8cm, then inhale
Acoustic performance change is little, more stable.
The density of composite sound-absorbing material of the present invention is also the key factor changing low frequency absorption performance, the reduction of density of material
The assimilation effect of low frequency will be improved, make sound absorption curve move to low frequency simultaneously.
The size changing material back cavity will affect the low frequency absorption performance of material, and the increase of cavity is equivalent to improve
The thickness of material, can optimize the acoustically effective of sound absorption frequency by the size adjusting cavity.
In sum, sound-absorbing material of the present invention is a kind of excellent sound-absorbing material, particularly with in, low-frequency sound have good
Good acoustically effective, simultaneously because density is low, light weight, durable, material cost is relatively inexpensive, has formaldehyde adsorption, purifies sky
Gas, the advantage optimized the environment, it is of many uses, both can be used for sqouynd absorption lowering noise at urban road and residential home, and be also applied for electricity
The place that sound barrier is had higher requirements by movie theatre, music hall etc., therefore there is the biggest market prospect, be worth promoting and
Application.
Relevant list of references:
1, Li Haitao, the progress [J] of porous sound-absorbing material, Materials Science and Engineering journal, 2004,22(6) 934-
938；
2, Zhou Dongliang, the preparation method of cement based compound porous sound-absorbing material and performance [J], noise and vibration control, 2008,28
(4): 136-137；
3, Hu Guangbin, the review of China compressed straw slab development and the problem [J] that presently, there are, forest product industry, 2004,31(2): 7-
10；
4, rectify, Ye Chao, Wu Ming, Yang Jun, the new method [J] of a kind of in-site measurement material sound absorption characteristics, acoustic journal, 2010,
35(2): 162-168；
5, He Donglin, Guo Zhancheng, Liao Hongqiang, the progress of sound-absorbing porous material and development trend [J], material Leader, 2012
(1): 303-306.
Embodiment described above is only to be described the preferred embodiment of the present invention, the not model to the present invention
Enclose and be defined, on the premise of designing spirit without departing from the present invention, the those of ordinary skill in the art technical side to the present invention
Various deformation that case is made and improvement, all should fall in the protection domain that claims of the present invention determines.
Claims (9)
1. the preparation method of a composite sound-absorbing material, it is characterised in that (1) grass stalk is put in the lime water of 2% and soak
30min carries out demoulding process, removes the wax coat on weeding stalk surface so that and the cohesive force reinforcement between diatom ooze；(2) will remove
The grass stalk of surface waxiness is put into and is cut into 40mm 100mm length in grass chopper；(3) diatom ooze, grass stalk and water are pressed 1:0.2:0.3
Mass ratio mix, afterwards diatom ooze under hydration and grass stalk combine, be subsequently adding 1% polyvinyl alcohol adhesive, 1%
Triethanolamine reinforcing agent, becomes the compound of leather hard in mixing and blending machine after stirring；(4) by leather hard
Compound is paved in mold box, is sent in press pressurization by transmission equipment, applies different pressures according to purposes with type
Power, unit pressure is 1.5-2.0 MPa, and the compound of densification leather hard afterwards also fastens with locking device, maintains pressurized
The consolidation of diatom ooze and grass stalk is completed under state；(5) in order to shorten firm time, the compound temperature to be placed in of locking is at 70-
Hardening in the strengthening curing kilns of 90 degrees Celsius, the time is 18-24h then mould unloading, then natural curing is entered for 7 days under keeping warm mode
Row is dried, and baking temperature is 50-70 DEG C, and the moisture content making compound is 5% ± 2%, to reduce the use contractility of compound,
Improve the stability of its size, then carry out cutting edge shaping and sanding processes to guarantee that compound meets size and the thickness of user
Requirement.
The preparation method of a kind of composite sound-absorbing material the most according to claim 1, it is characterised in that described grass stalk is Caulis et Folium Oryzae
Stalk.
The preparation method of a kind of composite sound-absorbing material the most according to claim 2, it is characterised in that described Caulis et Folium Oryzae stalk is put into
Grass chopper is cut into 80mm length.
4. a composite sound-absorbing material, makes according to the preparation method described in Claims 2 or 3.
A kind of composite sound-absorbing material the most according to claim 4, it is characterised in that described composite sound-absorbing material Caulis et Folium Oryzae stalk
Content is 5-10%.
A kind of composite sound-absorbing material the most according to claim 4, it is characterised in that the density of described composite sound-absorbing material is
350-500 kg/m3。
A kind of composite sound-absorbing material the most according to claim 4, it is characterised in that described composite sound-absorbing material thickness is 2-
10cm。
A kind of composite sound-absorbing material the most according to claim 4, it is characterised in that the sky at described composite sound-absorbing material back
Chamber width is 0-3cm.
9. according to the arbitrary a kind of composite sound-absorbing material of claim 58, it is characterised in that described composite sound-absorbing material Caulis et Folium Oryzae
The content of stalk is 7.5%, and the density of described composite sound-absorbing material is 500 kg/m3, and the thickness of described composite sound-absorbing material is 8cm,
The cavity width at described composite sound-absorbing material back is 3cm.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108840713A (en) * | 2018-08-27 | 2018-11-20 | 安徽微威胶件集团有限公司 | A kind of composite sound-absorbing material |
| CN109081667A (en) * | 2018-08-27 | 2018-12-25 | 安徽微威胶件集团有限公司 | A kind of composite sound-absorbing material |
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| CN102464497A (en) * | 2010-11-05 | 2012-05-23 | 盐城工学院 | Waste brick tile/straw foam concrete and preparation method thereof |
| CN104234290A (en) * | 2013-06-09 | 2014-12-24 | 开县红火建材有限公司 | A micropore hollow brick and a preparing method thereof |
| CN104827545A (en) * | 2015-04-10 | 2015-08-12 | 重庆宝红农业开发有限公司 | Rice straw brick preparation method as well as rice straw bricks and application of rice straw bricks |
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Application publication date: 20161221 |